题目内容：

belong in和belong to用法区别
如上……听力中有一句Ther are bound to be some words and phrases that belong in formal language and others that are informal.
为什么用in不用to 咧……具体区别?

优质解答

belong in 应归于...（地方、范畴）
belong to 属于...财产/一部分/成员