diff --git a/.github/workflows/lint-check.yml b/.github/workflows/lint-check.yml
index ea51323b..e6930272 100644
--- a/.github/workflows/lint-check.yml
+++ b/.github/workflows/lint-check.yml
@@ -22,8 +22,6 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v6
-        with:
-          fetch-depth: 0
 
       - name: Set up Python
         uses: actions/setup-python@v6
diff --git a/.github/workflows/python-publish.yml b/.github/workflows/python-publish.yml
index 1cbc8c44..5d2d2f3e 100644
--- a/.github/workflows/python-publish.yml
+++ b/.github/workflows/python-publish.yml
@@ -16,8 +16,6 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v6
-        with:
-          fetch-depth: 0
 
       - name: Set up Python
         uses: actions/setup-python@v6
diff --git a/.github/workflows/test-build.yml b/.github/workflows/test-build.yml
index cc655207..6f944269 100644
--- a/.github/workflows/test-build.yml
+++ b/.github/workflows/test-build.yml
@@ -23,8 +23,6 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v6
-        with:
-          fetch-depth: 0
 
       - name: Set up Python
         uses: actions/setup-python@v6
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 5142329d..262d995d 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -25,8 +25,6 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v6
-        with:
-          fetch-depth: 0
 
       - name: Set up Python
         uses: actions/setup-python@v6
diff --git a/.gitignore b/.gitignore
index b86d0a41..b4d7b9c8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,25 +1,37 @@
+# Python 和工具缓存
 __pycache__
 .pytest_cache
 .mypy_cache
 .coverage
+
+# 虚拟环境
 .venv
-htmlcov
+
+# 构建输出
 dist
 Annotations2Sub.egg-info
+
+# 覆盖率报告
+htmlcov
+
+# 杂项
 测试用例/
-src/tests/garbage/*
-!src/tests/garbage/stub
-report
 *.mp4
 *.mkv
 *.webm
 *.xml
 *.ass
+
+src/tests/garbage/*
+!src/tests/garbage/stub
+
+report
 *.lnk
 *.ps1
 *.pyz
 *.dot
 *.prof
+
 mypy.ini
 uv.lock
 .python-version
diff --git a/DOCUMENTATION.md b/DOCUMENTATION.md
index cbcffaa9..93f71607 100644
--- a/DOCUMENTATION.md
+++ b/DOCUMENTATION.md
@@ -461,7 +461,6 @@ subtitles_string = AnnotationsXmlStringToSubtitlesString(xml_string)
 with open('output.ass', 'w', encoding='utf-8') as f:
     f.write(subtitles_string)
 
-# If you're concerned about licensing issues, you can contact me for an alternative license.
 ```
 
 ### Comparison with Similar Software
@@ -502,3 +501,7 @@ Metadata database of videos with annotations.
 [Annotations2Sub-Lite](https://a2s.liutao.page/)
 
 A web version made by AI.
+
+[Ar tonelico 系列 中文字幕 (Rain Shimotsuki 注释字幕还原) 合集](https://www.bilibili.com/video/BV1Ff4y1t7Dj)
+
+This project is a derivative of this project.
diff --git a/src/Annotations2Sub/Annotations.py b/src/Annotations2Sub/Annotations.py
index eab090bf..66d07753 100644
--- a/src/Annotations2Sub/Annotations.py
+++ b/src/Annotations2Sub/Annotations.py
@@ -2,6 +2,7 @@
 
 import datetime as dt
 import math
+import re
 from datetime import datetime
 from typing import List, Optional, Union
 from xml.etree.ElementTree import Element
@@ -192,55 +193,36 @@ def ParseAnnotationColor(colorString: str) -> Color:
             return Color(red=r, green=g, blue=b)
 
         def ParseTime(timeString: str) -> datetime:
-            def parseFloat(string: str) -> float:
-                def cleanInt(string: str) -> str:
-                    string = string.replace("s", "")
-                    string = string.replace("-", "")
-                    string = string.replace("%", "")
-
-                    if string == "NaN":
-                        return "0"
-                    if string == "aN":
-                        return "0"
-                    if "#" in string:
-                        return "0"
-                    return string
-
-                if string == "":
-                    return 0
-                if string == "4294967294":
-                    return 0
-                if string == "&":
-                    return 0
-                if string == "NaN":
-                    return 0
-
-                part = string.split(".")
-                part = list(map(cleanInt, part))
-                string = part[0]
-                if len(part) > 1:
-                    string = string + "." + part[1]
-                return float(string)
-
-            if timeString == "":
-                return datetime.strptime("0", "%S")
-            if timeString == "never":
-                return datetime.strptime("0", "%S")
-            if timeString == "undefined":
-                return datetime.strptime("0", "%S")
-
             parts = timeString.split(":")
             seconds = 0.0
 
             for part in parts:
-                time = parseFloat(part)
+                time = ParseFloat(part)
                 seconds = 60 * seconds + abs(time)
 
             return datetime.fromtimestamp(seconds, dt.timezone.utc).replace(tzinfo=None)
 
         def ParseFloat(string: str) -> float:
-            string = string.replace(",", ".")
-            return float(string)
+            def parseFloat(string: str) -> float:
+                match = re.match(
+                    r"[+-]?(\d+(\.\d*)?|\.\d+)([eE][+-]?\d+)?", string.lstrip()
+                )
+                if match != None:
+                    number = float(match.group(0))
+                    return number
+                return 0.0
+
+            try:
+                number = float(string)
+            except ValueError:
+                number = parseFloat(string)
+
+            if math.isnan(number):
+                return 0.0
+            if number > 2147483647:
+                return 0.0
+
+            return number
 
         _id = each.get("id", "")
         if _id == "":
@@ -304,8 +286,6 @@ def ParseFloat(string: str) -> float:
 
         if w < 0:
             w = 0
-        if math.isnan(w):
-            w = 0
 
         author = each.get("author", "")
 
diff --git a/src/Annotations2Sub/__init__.py b/src/Annotations2Sub/__init__.py
index 4f272a44..548dc866 100644
--- a/src/Annotations2Sub/__init__.py
+++ b/src/Annotations2Sub/__init__.py
@@ -8,6 +8,7 @@
 
 此工具可以帮助您将 YouTube 注释转换为 ASS 字幕文件, 您可以播放或添加到视频中.
 """
+
 """
                                              xml.
                                              etree.
@@ -97,6 +98,10 @@
 
 随着时间流逝, 本项目所依赖的外部服务已逐渐变得不可用, 现已移除相关功能. 感谢 Invidious 和 Internet Archive 所提供的帮助.
 
+---
+
+又是时光流逝 Vibe Code 已成现实, Agents 已成长的他妈都不认识.
+
 ---
 - 注释(Annotations): YouTube 的功能
 - SSA(Sub Station Alpha): 字幕格式
diff --git a/src/Annotations2Sub/cli.py b/src/Annotations2Sub/cli.py
index c5fe2f04..8d5d6dcb 100644
--- a/src/Annotations2Sub/cli.py
+++ b/src/Annotations2Sub/cli.py
@@ -19,7 +19,7 @@
 
 
 def Run(args=None) -> int:
-    """命令行应用的实现
+    """命令行界面的实现
 
     参数应当是 `list(str)`,
     当参数为 `None` 时 `argparse` 会从 `sys.argv` 解析参数.
diff --git a/src/Annotations2Sub/color.py b/src/Annotations2Sub/color.py
index 81a2e614..0ad4023a 100644
--- a/src/Annotations2Sub/color.py
+++ b/src/Annotations2Sub/color.py
@@ -1,33 +1,23 @@
 # -*- coding: utf-8 -*-
 
+from dataclasses import dataclass
+
 from Annotations2Sub.i18n import _
 
 
+@dataclass
 class Color:
-    def __init__(
-        self,
-        red: int = 0,
-        green: int = 0,
-        blue: int = 0,
-    ):
-        if red > 255:
-            raise ValueError(_('"red" 必须在 0-255 之间'))
-        if green > 255:
-            raise ValueError(_('"green" 必须在 0-255 之间'))
-        if blue > 255:
-            raise ValueError(_('"blue" 必须在 0-255 之间'))
-        self.red = red
-        self.green = green
-        self.blue = blue
+    red: int = 0
+    green: int = 0
+    blue: int = 0
 
 
+@dataclass
 class Alpha:
-    def __init__(self, alpha: int = 0):
-        if alpha > 255:
-            raise ValueError(_('"alpha" 必须在 0-255 之间'))
-        self.alpha = alpha
+    alpha: int = 0
 
 
+@dataclass
 class Rgba:
     def __init__(self, color: Color = Color(), alpha: Alpha = Alpha()):
         self.red = color.red
diff --git a/src/README.md b/src/README.md
index f43ed35c..9fe1f12c 100644
--- a/src/README.md
+++ b/src/README.md
@@ -1,22 +1,38 @@
 # Annotations2Sub Source Code
 
-## 快速背景
+## 概述
 
-本仓库是一个用于将旧版 YouTube Annotations 的 XML 文件转换为 ASS 字幕文件的命令行工具. 包的入口点是控制台脚本 `Annotations2Sub`(在 `pyproject.toml` -> `project.scripts` 中定义). 主要代码位于 `src/Annotations2Sub/`, 测试代码位于 `src/tests/`.
+Annotations2Sub 是一个将旧版 YouTube Annotations 的 XML 文件转换为 ASS 字幕文件的命令行工具. 入口点是控制台脚本 `Annotations2Sub`. 主要代码位于 `src/Annotations2Sub/`, 测试代码位于 `src/tests/`.
+
+## 技术栈
+
+- Python 3.7+
+- 无外部依赖
+- 使用 [uv](https://github.com/astral-sh/uv) 管理工具链, 使用 setuptools 打包, pytest 测试, mypy 类型检查, isort 和 black 进行代码格式化.
 
 ## 组织结构
 
-- 目的: 读取 YouTube Annotations XML 文件并生成 ASS 字幕文件. 用户用法见 `README.md`: `Annotations2Sub <file.xml>`.
-- 流程: 解析(`Annotations.py`)、转换(`convert.py`)、输出(`subtitles/*`).
+- 流程: 解析(`Annotations.py`)、转换(`convert.py`)和输出(`subtitles/*`).
+- 入口: `src/Annotations2Sub/_main.py` 或 `src/Annotations2Sub/__main__.py`.
 - 核心模块:
-  - `src/Annotations2Sub/_main.py` 或 `src/Annotations2Sub/__main__.py` —— 程序入口.
-  - `src/Annotations2Sub/Annotations.py` —— XML 解析和Annotations数据结构.
-  - `src/Annotations2Sub/convert.py` —— 主要的转换逻辑和数据变换.
-  - `src/Annotations2Sub/subtitles/` —— 字幕格式、样式、事件和绘图辅助.
+  - `src/Annotations2Sub/Annotations.py` : XML 解析和Annotations数据结构.
+  - `src/Annotations2Sub/convert.py` : 主要转换逻辑.
+  - `src/Annotations2Sub/subtitles/` : 字幕格式、样式、事件和绘图辅助.
+  - `src/Annotations2Sub/cli.py` : 用户界面.
+- 测试:
+  - `src/tests/test_Baseline.py` : 回归测试.
+  - `src/tests/test_cli.py` : 集成测试.
+  - `src/tests/test_addendum.py` : 以上两个测试未覆盖的测试.
+  - `src/tests/unittest/` : 其他测试.
+
+## 项目特有的模式
+
+- 测试用例是 Youtube Annotations, 使用 `src/tests/testCase/` 下的 `.test` 文件作为输入, 同时包含以 `.ass.test`、`.transform.ass.test` 等后缀的期望输出文件.
+- gettext `.po`/`.mo` 文件在 `src/Annotations2Sub/locales/`. 如有用户可见字符串变更, 请更新 `.po` 文件并重新生成 `.mo`.
 
 ## 如何运行、测试和代码检查
 
-- 推荐使用 [uv](https://github.com/astral-sh/uv) 进行依赖管理和运行.
+- 使用 [uv](https://github.com/astral-sh/uv) 进行依赖管理.
 
   `uv sync`
 
@@ -38,20 +54,7 @@
 
   `black .`
 
-## 项目特有的模式和约定
-
-- 测试用例是 Youtube Annotations, 使用 `src/tests/testCase/` 下的 `.test` 文件作为输入, 同时包含以 `.ass.test`、`.transform.ass.test` 等后缀的期望输出文件.
-- 添加类型注解并保持 mypy 检查通过.
-- 使用 isort 和 black 进行代码格式化.
-- 本地化: gettext `.po`/`.mo` 文件在 `src/Annotations2Sub/locales/`. 如有用户可见字符串变更, 请更新 `.po` 文件并重新生成 `.mo`.
-
-## 集成点与外部依赖
-
-- 无外部依赖.
-- 构建/打包使用 setuptools.
-- CI 会上传覆盖率到 Codecov.
-
-## 调试注释行为
+## 调试 Annotations 行为
 
 使用[youtube_annotations_hack](https://github.com/USED255/youtube_annotations_hack)来预览正确的注释行为.
 
@@ -61,7 +64,7 @@
 
 ## 问题咨询
 
-- 在 GitHub 提 [issue](https://github.com/USED255/Annotations2Sub/issues).
+请在 GitHub 提 [issue](https://github.com/USED255/Annotations2Sub/issues).
 
 ## 您也可以看看
 
@@ -71,7 +74,7 @@
 
 - https://github.com/weizhenye/ASS/wiki/ASS-字幕格式规范
 
-  整理过的关于 ASS 字幕文件的格式以及渲染行为的文档.
+  整理好的关于 ASS 字幕文件的格式以及渲染行为的文档.
 
 - https://github.com/USED255/youtube_annotations_hack
 
diff --git a/src/tests/test_addendum.py b/src/tests/test_addendum.py
new file mode 100644
index 00000000..e74ba4b1
--- /dev/null
+++ b/src/tests/test_addendum.py
@@ -0,0 +1,82 @@
+# -*- coding: utf-8 -*-
+
+# Baseline 和 cli 测试未覆盖的部分
+
+import gettext
+import os
+import sys
+
+import pytest
+
+import Annotations2Sub.__main__
+from Annotations2Sub import Annotation, Subtitles
+from Annotations2Sub.i18n import internationalization
+from Annotations2Sub.subtitles import Event, Style
+from Annotations2Sub.utils import Err1, Warn1
+
+
+def test_internationalization_FileNotFoundError():
+    def f(*args, **kwargs):
+        raise FileNotFoundError
+
+    m = pytest.MonkeyPatch()
+    m.setattr(gettext, "translation", f)
+
+    assert internationalization()
+
+    m.undo()
+
+
+def test_internationalization_win32():
+    m = pytest.MonkeyPatch()
+    m.setattr(sys, "platform", "win32")
+    m.setattr(os, "getenv", lambda x: None)
+
+    assert internationalization()
+
+    m.undo()
+
+
+def test_repr_Annotation():
+    assert repr(Annotation()) == str(Annotation())
+
+
+def test_eq_Annotation():
+    assert Annotation() == Annotation()
+
+
+def test_repr_Style():
+    assert repr(Style()) == str(Style())
+
+
+def test_eq_Style():
+    assert Style() == Style()
+
+
+def test_repr_Event():
+    assert repr(Event()) == str(Event())
+
+
+def test_eq_Event():
+    assert Event() == Event()
+
+
+def test_repr_Sub():
+    assert repr(Subtitles()) == str(Subtitles())
+
+
+def test_eq_Sub():
+    assert Subtitles() == Subtitles()
+
+
+def test_Err1():
+    Err1("Test")
+
+
+def test_Warn1():
+    Warn1("Test")
+
+
+def test_main():
+    with pytest.raises(SystemExit):
+        Annotations2Sub.__main__.main()
diff --git a/src/tests/test_other.py b/src/tests/test_other.py
deleted file mode 100644
index 1387d8b1..00000000
--- a/src/tests/test_other.py
+++ /dev/null
@@ -1,3 +0,0 @@
-# -*- coding: utf-8 -*-
-
-# import Annotations2Sub.__main__
diff --git a/src/tests/unittest/test_Annotation.py b/src/tests/unittest/test_Annotation.py
index 53ecc1cc..9f2023d1 100644
--- a/src/tests/unittest/test_Annotation.py
+++ b/src/tests/unittest/test_Annotation.py
@@ -21,14 +21,6 @@ def test_str_Annotation():
     )
 
 
-def test_repr_Annotation():
-    assert repr(Annotation()) == str(Annotation())
-
-
-def test_eq_Annotation():
-    assert Annotation() == Annotation()
-
-
 def test_Parse():
     filePath = os.path.join(testCasePath, "annotations.xml.test")
     with open(filePath, "r", encoding="utf-8") as f:
diff --git a/src/tests/unittest/test_Color.py b/src/tests/unittest/test_Color.py
index 0a1df975..420f31d4 100644
--- a/src/tests/unittest/test_Color.py
+++ b/src/tests/unittest/test_Color.py
@@ -1,7 +1,5 @@
 # -*- coding: utf-8 -*-
 
-import pytest
-
 from Annotations2Sub.color import Alpha, Color, Rgba
 
 
@@ -12,25 +10,11 @@ def test_Color():
     assert color.blue == 0
 
 
-def test_Color_ValueError():
-    with pytest.raises(ValueError):
-        Color(256, 0, 0)
-    with pytest.raises(ValueError):
-        Color(0, 256, 0)
-    with pytest.raises(ValueError):
-        Color(0, 0, 256)
-
-
 def test_Alpha():
     alpha = Alpha(0)
     assert alpha.alpha == 0
 
 
-def test_Alpha_ValueError():
-    with pytest.raises(ValueError):
-        Alpha(256)
-
-
 def test_Rgba():
     rgba = Rgba(Color(0, 0, 0), Alpha(0))
     assert rgba.red == 0
diff --git a/src/tests/unittest/test_Subtitles.py b/src/tests/unittest/test_Subtitles.py
index fbb4e452..2baf7ccb 100644
--- a/src/tests/unittest/test_Subtitles.py
+++ b/src/tests/unittest/test_Subtitles.py
@@ -15,14 +15,6 @@ def test_str_Style():
     )
 
 
-def test_repr_Style():
-    assert repr(Style()) == str(Style())
-
-
-def test_eq_Style():
-    assert Style() == Style()
-
-
 def test_Event():
     assert Event()
 
@@ -31,22 +23,12 @@ def test_str_Event():
     assert str(Event()) == "Dialogue: 0,00:00:00.00,00:00:00.00,Default,,0,0,0,,\n"
 
 
-def test_repr_Event():
-    assert repr(Event()) == str(Event())
-
-
-def test_eq_Event():
-    assert Event() == Event()
-
-
 def test_Sub():
     assert Subtitles()
 
 
 def test_str_Sub():
-    assert (
-        str(Subtitles())
-        == """[Script Info]
+    assert str(Subtitles()) == """[Script Info]
 ScriptType: v4.00+
 Title: Default File
 
@@ -58,15 +40,6 @@ def test_str_Sub():
 Format: Layer, Start, End, Style, Name, MarginL, MarginR, MarginV, Effect, Text
 
 """
-    )
-
-
-def test_repr_Sub():
-    assert repr(Subtitles()) == str(Subtitles())
-
-
-def test_eq_Sub():
-    assert Subtitles() == Subtitles()
 
 
 def test_DrawCommand():
diff --git a/src/tests/unittest/test_i18n.py b/src/tests/unittest/test_i18n.py
index 51a912b4..4c143b50 100644
--- a/src/tests/unittest/test_i18n.py
+++ b/src/tests/unittest/test_i18n.py
@@ -1,11 +1,5 @@
 # -*- coding: utf-8 -*-
 
-import gettext
-import os
-import sys
-
-import pytest
-
 from Annotations2Sub.i18n import internationalization
 
 
@@ -13,28 +7,6 @@ def test_internationalization():
     assert internationalization()
 
 
-def test_internationalization_FileNotFoundError():
-    def f(*args, **kwargs):
-        raise FileNotFoundError
-
-    m = pytest.MonkeyPatch()
-    m.setattr(gettext, "translation", f)
-
-    assert internationalization()
-
-    m.undo()
-
-
-def test_internationalization_win32():
-    m = pytest.MonkeyPatch()
-    m.setattr(sys, "platform", "win32")
-    m.setattr(os, "getenv", lambda x: None)
-
-    assert internationalization()
-
-    m.undo()
-
-
 def test_gettext():
     _ = internationalization()
     assert _("警告: ") == "警告: "
diff --git a/src/tests/unittest/test_utils.py b/src/tests/unittest/test_utils.py
index 1e794967..1c7c4743 100644
--- a/src/tests/unittest/test_utils.py
+++ b/src/tests/unittest/test_utils.py
@@ -38,14 +38,6 @@ def test_Info():
     Info("Test")
 
 
-def test_Err1():
-    Err1("Test")
-
-
-def test_Warn1():
-    Warn1("Test")
-
-
 def test_Err2():
     Err2("Test")
 
diff --git "a/\346\226\207\346\241\243.md" "b/\346\226\207\346\241\243.md"
index f90846d0..84adc23b 100644
--- "a/\346\226\207\346\241\243.md"
+++ "b/\346\226\207\346\241\243.md"
@@ -462,7 +462,6 @@ subtitles_string = AnnotationsXmlStringToSubtitlesString(xml_string)
 with open('output.ass', 'w', encoding='utf-8') as f:
     f.write(subtitles_string)
 
-# 如果你担心许可证问题, 可以联系我给你其他许可证.
 ```
 
 ### 与同类软件的对比
@@ -503,3 +502,7 @@ Annotations2Sub:
 [Annotations2Sub-Lite](https://a2s.liutao.page/)
 
 AI 做的网页版本.
+
+[Ar tonelico 系列 中文字幕 (Rain Shimotsuki 注释字幕还原) 合集](https://www.bilibili.com/video/BV1Ff4y1t7Dj)
+
+本项目是此项目的衍生项目.