7.to have your cake and eat it or to have your cake and eat it too(不切实际地希望)两全其美；鱼与熊掌兼得
He wants a switch to a market economy without reducing the standard of living. This sounds like wanting to have his cake and eat it.他希望在不降低生活水平的前提下转向市场经济。这听起来像是希望鱼和熊掌兼得。
8.a piece of cake<非正式>(easy)轻而易举的事；举手之劳
Getting rid of him will be a piece of cake.摆脱他是小事一桩。
9.to take the cake<美>(be outstandingly bad)糟糕到极点
As far as vacuous teen flicks go, this one takes the cake.这部电影在内容空洞的青春片当中算是最糟糕的了。