easy as pie
非常容易，輕而易舉
口語·形容非常容易
英文釋義
very easy or simple
例句
Don't worry about the test; it's easy as pie if you've studied the notes.
典故來源
源自19世紀(jì)美國，用“吃派”的輕松體驗(yàn)比喻做事情毫不費(fèi)力。