You use hers to indicate that something belongs or relates to a woman, girl, or female animal.
双语例句
例：
His hand as it shook hers was warm and firm.
当他握住她的手时，他的手温暖而有力。
例：
Professor Camm was a great friend of hers.
卡姆教授是她的一位挚友。
2.?（书面英语中泛指人）她的 , 他的
In written English, hers is sometimes used to refer to a person without saying whether that person is a man or a woman. Some people dislike this use and prefer to use 'his or hers' or 'theirs'.
双语例句
例：
The author can report other people's results which more or less agree with hers.