at one's fingertips　了如指掌
How to get at that little island is at his fingertips.他知道怎么去那個(gè)小島。
at one's wit's end　智窮
Don't ask him.It is also at his wit's end.不要問(wèn)他了，他也不知道。
big shot 大人物，大亨
He is a big shot in our little town.
black sheep　敗家子，害群之馬
Every family has a black sheep.家家有本難念的經(jīng)。
black and blue　遍體鱗傷
The thief was caught of red-handed and beaten black and blue.那個(gè)小偷當(dāng)場(chǎng)被抓住并被打得青一塊紫一塊的。
black and white　白紙黑字
The proof is in black and white and the murderer has no any excuses.證據(jù)確鑿，兇手再也無(wú)話可說(shuō)。