“每个”用来说一个群里的所有东西或人，一个也不少。

"每个" is used to refer to all things or people in a group, without missing a single one.

我们常说“每个人”“每个星期”，意思是没有一个例外。

We often say "每个人" (every person) or "每个星期" (every week), meaning without any exceptions.