"They" 和 "those" 都是代词，但它们在用法和含义上有一些区别。
"They" 是一个中性代词，可以用来代替任何名词或名词短语。例如，如果你提到一个群体，你可以用 "they" 来代替这个群体。例如：
* The students are in the library. They are studying for their exams.
* My friends are waiting for me. They are wearing red hats.
"Those" 是一个特定的代词，通常用来代替前面提到的特定的名词或名词短语。例如：
* I like the shoes. I will buy those.
* They are watching TV. Those are their favorite programs.
此外，"those" 通常用于指代距离较远的人或物，而 "they" 则没有这个限制。例如：
* Look at those flowers over there. They are beautiful.
* I can't hear what they are saying, but I can hear what those people are shouting.
需要注意的是，"those" 只能用来指代可数名词，而 "they" 可以用来指代不可数名词和可数名词。例如：
* Water is a precious resource. We should save it. (不可数名词)
* I like to read books. I have read many of them. (可数名词复数)
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