在 discord.py 文档中，有扩展:https://discordpy.readthedocs.io/en/stable/ext/commands/extensions.html和齿轮:https://discordpy.readthedocs.io/en/stable/ext/commands/cogs.html有什么区别?
In the discord.py documention, there are Extensions: https://discordpy.readthedocs.io/en/stable/ext/commands/extensions.html and Cogs: https://discordpy.readthedocs.io/en/stable/ext/commands/cogs.html what is the difference?
扩展是被加载的文件，当你调用 load_extension 时，将它们视为 discord.py 库导入的模块.导入发生后，一个 setup 函数被调用，并被传递给它被加载到的 Bot 实例......本质上是 module.setup(bot).就是这样，没有更多的扩展......通常这个设置函数调用 add_cog 将在下面描述，但是没有要求他们这样做.
Extensions are files that are loaded, think of them as modules that the discord.py library imports when you call load_extension. After the import happens, a setup function is called, and is passed the Bot instance that it was loaded into....essentially module.setup(bot). That is it, there is no more to extensions...typically this setup function calls add_cog which will be described next, however there is no requirement that they do so.
Cog 是从 commands.Cog 继承的类，并通过 add_cog 添加到机器人的 cog 列表中，这些类通常包含命令并充当"类别"对于这些命令.它还可以容纳诸如 on_message 或 on_member_join 等事件的侦听器.
A Cog is a class that inherits from commands.Cog and is added to the bot's list of cogs through add_cog, these classes typically house commands and act as a "category" for these commands. It can also house listeners for events such as on_message or on_member_join, etc.
TL;DR - 扩展是导入的模块，cogs 是类
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