The white cup is mine, and the pink one is hers.
白色的杯子是我的，粉色的是她的。
When I had asked her about hers, and she had told me it was the twenty-first of October, she hadn't asked me when mine was.
我问她的生日是什么时候时，她告诉过我是在十月二十一日，她没有问我的生日。
We usually use possessive adjectives, like mine / mine and yours / yours and his / his and hers / hers, when the people speaking know what they are referring to and it is understood by both.
当谈话中的人们知道他们在指什么，双方都不言自明时通常用形容词的所有格，像mine / 我的和 yours / 你的和 his / 他的和hers /她的。
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