their是形容词物主代词，后面可以接名词。 theirs是名词性物主代词，后面不能接名词。
意思都是：他们的.
their + 名词 = theirs
例句：
These books are theirs. 这些书是他们的。
= These are their books. 这些是他们的书。
their 形容词性物主代词，后跟名词
theirs 名词性物主代词，后不能跟名词
注：their + 名词= theirs
their 形容词性物主代词, 后跟名词, 如their desks.
theirs名词性物主代词, 后不加名词. These are our books. Theirs are over there.
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