Learner's definition of THEIRS
1
: that which belongs to or is connected with them : their one : their ones(属于)他们的,她们的,它们的 -
The computer is theirs. [=the computer belongs to them; it is their computer]这台电脑是他们的。
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He bought his car on the same day his parents bought theirs.他和他父母在同一天各自买了车。
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She is a friend of theirs. [=she is their friend]她是他们的朋友。
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That dog of theirs [=their dog] is always barking.他们的狗总是在狂吠。
2
: his or hers —
used to refer to a single person whose sex is not known or specified(属于)他的,她的(用于指性别不详的某个人的)