A1 used as the subject of a verb to refer to people, animals, or things already mentioned or, more generally, to a group of people not clearly described(作主语)他们,她们,它们
B1 used to avoid saying "he or she"(用于代替 he 或 she)他/她
More examples
My parents live down in Florida, but they come up to Chicago every summer.
"Thank you for the flowers." "It's all right. I thought they might cheer you up."
An ambulance crew was called to his home, but he was dead by the time they arrived.
Most children in the UK remain in full-time education until they are at least 16 years old.
Oil and water don't mix. Even if you shake them together they separate into two layers.
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