1 the people or things that have been mentioned （提过的人或事物）他们，她们，它们: We've got two children. They're both boys. 我们有两个孩子，都是男的。‘Have you seen my keys?’ ‘Yes, they're on the table.’ “你看见我的钥匙没有？”“看见了，在桌上。”

2 people in general or people whose identity is not known or stated 人（泛指）；人们: They say it's going to be a mild winter. 听人说今年的冬天将会很暖和。

3 (informal 非正式) used instead of he or she （用于代替he或she）: Somebody phoned for you but they didn't leave their name. 有人打电话找你，但没有留下姓名。