but、however、still、yet、nevertheless、while与whereas这些连词或副词均含“但是、可是、然而、而”之意。
but : 口语常用词，语气较强，泛指与前述情况相反。
- She's very hard-working but not very imaginative.
她工作很努力，但缺乏想象力。 - This is not caused by evil, but by simple ignorance.
这并不是恶意而为，只是由于无知。 - The play's good, but not that good - I've seen better.
这出戏还可以，但也不是多好——我看过更好的。
however : 表转折关系，语气稍弱于but，连接性也弱一些，因而常作插入语。
- This is one possible solution to the problem. However, there are others.
这是该问题的一种可能的解决办法，但还有其他的办法。 - There may, however, be other reasons that we don't know about.
然而，可能还有其他我们不知道的原因。
still : 语气强，多用于肯定句或疑问句。指尽管作出让步，采取措施或表示反对，但情况仍然如故，无所改变。
- You may not approve of what he did, but he's still your brother.
你可能不赞成他的所作所为，但他仍然是你的兄弟。 - I know you don't like her, but you still don't have to be so rude to her.
我知道你不喜欢她，但尽管如此，你也没必要对她那么无礼。
yet : 常用于否定句，语气比still稍强。指不管作出多大努力或让步，仍达不到预期的结果。
- It's a small car, yet it's surprisingly spacious.
这辆汽车不大，然而却出奇地宽敞。 - He has a good job, and yet he never seems to have any money.
他有份好工作，然而他却好像总也没有钱。 - simple yet effective
简单而又高效
nevertheless : 指尽管作出完全让步，也不会发生任何影响。
- I knew a lot about the subject already, but her talk was interesting nevertheless.
关于这个话题我已经知之甚多，但她的报告听起来还是很有趣。
while : 表对比，一般可与whereas换用，但程度弱一些。
- While I accept that he's not perfect in many respects, I do actually like the man.
虽然我承认他在很多方面不是那么完美，但我实际上还是非常喜欢这个男人的。 - While I fully understand your point of view, I also have some sympathy with Michael's.
尽管我完全能理解你的观点，但我在一定程度上也赞同迈克尔的观点。
whereas : 表对比，一般可与while互换。
- He must be about 60, whereas his wife looks about 30.
他肯定有60岁上下了，可他妻子看起来只有30岁左右。 - You eat a huge plate of food for lunch, whereas I have just a sandwich.
你午饭吃了一大盘东西，可我只吃了个三明治。
