ut[英][bət][美][bʌt,bət]
conj.但是; 而是; 除了; 只因为;
prep.除…以外;
adv.只; 不过; 只是; 另一方面;
n.借口; 推辞; 但是; 反对;
pron.[关系代词,意义相当于 who…not,which…not];
vt.对…说“但是”;
复数：buts1.CONJ-COORD可是；但是；然而You use but to introduce something which contrasts with what you have just said,or to introduce something which adds to what you have just said.
'You said you'd stay till tomorrow.' — 'I know,Bel,but I think I would rather go back.'...
“你说过你要呆到明天的.”——“我知道,贝尔,但我还是想回去.”
Place the saucepan over moderate heat until the cider is very hot but not boiling...
把炖锅置于中火上加热,直到苹果酒变得很烫,但不要加热到沸腾.
He not only wants to be taken seriously as a musician,but as a poet too.
他不仅希望被人当成一个真正的音乐家,还希望被看成一个诗人.
2.CONJ-COORD但是；不过You use but when you are about to add something further in a discussion or to change the subject.
They need to recruit more people into the prison service.But another point I'd like to make is that many prisons were built in the nineteenth century.
监狱需要招募更多的工作人员.但我想补充一点,很多监狱都是在19世纪建造的.
3.CONJ-COORD（用于表示歉意）但是You use but after you have made an excuse or apologized for what you are just about to say.
Please excuse me,but there is something I must say...
不好意思,但有些话我必须说.