代词没有所有格
形容词性 物主代词 their
名词性 物主代词 theirs
Make sure you get a good look at their faces.
你一定要仔细看清他们的面孔。
Their family has always been well thought of around here.
他们家在这一带一直颇受敬重。
Our children go to the same school as theirs.
我们的孩子和他们的孩子上同一所学校。
It's a favourite game of theirs.
这是他们最喜爱的游戏。