表示转折或对比 1) but表示转折,while表示对比. Some people love cats,while others hate them. 2) not…but… 意思为"不是……而是……"not 和but 后面的用词要遵循一致原则. They were not the bones of an animal,but of a human being. 3)although然而 I did not know that then,although I learned it later. 当时我不知道那件事,但我后来知道了. 4)however然而,可是,不过 I feel a bit tired.However,I can hold on. 我有点累了,但我能坚持下去.