You use he to refer to a man, boy, or male animal.
双语例句
例：
He could never quite remember all our names.
他绝不可能完全记住我们所有人的名字。
2.?一个人（性别不明的情况下用；有些人不喜欢这样用，而倾向于用“he或she”，或“they”）
In written English, he 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 'he or she' or 'they'.
双语例句
例：
The teacher should encourage the child to proceed as far as he can, and when he is stuck, ask for help.