A1 used, usually as the object of a verb or preposition, to refer to people, things, animals, situations, or ideas that have already been mentioned(they 的宾格)他们,她们,它们
B1 used to refer to one person whose sex is not known instead of saying "him" or "her"﹙用来指性别不详的人,以代替 him 或 her﹚
More examples
When you've finished your work sheets, clip them together and hand them in to me.
Babies are curious about everything around them.
Don't bother drying the pans - just leave them to drain.
If anyone rings for me, please tell them I'll be back in the office at four o'clock.
Her family invited me to stay with them for a few weeks.
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