代词他（她，它）们的; 在提及性别不详的人时，用以代替 him 或 her
形容词
1. They have lost their dog.
他们的狗丢了。
代词
1. their是什么意思
1. That's their business.
那是他们的事。
2. They have a house of their own.
他们自己有一所房屋。
2. 他(她)们的：they 他(她)们 | their 他(她)们的 | that 那;那个
3. their是什么意思
3. 他(她、它)们的：Her 她 | Their 他(她、它)们的 | Twins 孪生子
Their is the third person plural possessive determiner. their 是第三人称复数所有格限定词。
1. 他们的;她们的;它们的
You use their to indicate that something belongs or relates to the group of people, animals, or things that you are talking about.
e.g. Janis and Kurt have announced their engagement...
贾尼斯和库尔特已宣布订婚。
e.g. Horses were poking their heads over their stall doors.
马儿们从马厩门上探出头来。
2. (代替 his or her，而不指明是男是女;有人认为这种用法不对)
You use their instead of 'his or her' 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.
e.g. Every member will receive their own 'Welcome to Labour' brochure.
每个党员都将收到一本名为《欢迎加入工党》的小册子。
e.g. But anyone looking for income from their investments is in a much worse state.
但是，那些指望靠投资获取收入的人境况更为糟糕。
Apply for a school-(申请学校)
their
A：I’m trying to decide what school to apply for.
我在考虑申请哪一所学校。
B：Are you thinking about a public school or a private one？
是上公立学校还是私立学校？
A：I’m not sure. What’s the difference between them?
我也不知道。有什么区别？
B：Public schools are usually state funded, whereas private schools usually get their funding elsewhere.
公立学校通常是州政府投资办学，而私立学校通常是通过其他方式筹集资金。
A：Which is better?
那么哪一个更好呢？
B：One isn’t necessarily better than the other. It depends a lot on the school administration and the teachers.
不是一所就比另外一所好。这跟学校的管理和师资有很大关系。
their的意思
A：I hear you have to wear unifomp3s at private schools.
我听说私立学校要穿校服。
B：Yeah, sometimes.
是，有时候是这样。