piece of cake
非常容易的事情
口語(yǔ)·表達(dá)輕松完成
英文釋義
something that is very easy or simple
例句
Don't worry about the test, it'll be a piece of cake for you.
典故來(lái)源
源自20世紀(jì)初美國(guó),比喻像吃一塊蛋糕一樣簡(jiǎn)單輕松。