which/wɪtʃ; (US) hwɪtʃ/
adj., pron.1. 哪个Which do you want?你要哪个？
Which child knows the answer?哪个孩子知道答案？
2. …的那个the book which I like best我最喜欢的那本书
3. （在‘，’号之后，用以说明‘，’号前的词）这个，那个The river, which flows through London, is called the Thames.这条流经伦敦的河叫泰晤士河。
4. （表示关系）这个He changed his mind, which made me very angry.他改变了主意，这使我很生气。