but用来引出相反的意见,是口语常用语,如：sally was amused,but i was very embarrassed.萨莉很开心,但我却很尴尬.
nevertheless的含义为即使做出完全的让步,也没有任何影响,或者说也不是决定因素,如：there was no news；nevertheless,she went on hoping.一点消息也没有,但她仍抱着希望.