所有人都要提供嗎？
-Yes.
在一個地方超過6個月，就要當地警察局提供證明？
-Just need one indicating that this person (specific name) has no criminal record during the entire period of his/her residence in China.
這個要公證嗎？
-had better.
還是普通翻譯過來就行了
-May be also fine (ask the Consulate to make sure).
