theirs

1. PRON-POSS You use theirs to indicate that something belongs or relates to the group of people, animals, or things that you are talking about. 他们的; 她们的; 它们的 (东西)

There was a big group of a dozen people at the table next to theirs. 他们旁边的那张桌坐了一大群人，有十几个。

2. PRON-POSS You use theirs instead of "his or hers" to indicate that something belongs or relates to a person without saying whether that person is a man or a woman. Some people think this use is incorrect. 用于代替“他的”或“她的”，不指明是男是女，有些人认为这种用法不正确

He would leave the trailer unlocked. If there was something inside that someone wanted, it would be theirs for the taking. 他不会锁活动房屋。如果屋里有别人想要的东西，他们就可以拿走。