a piece of cake
非常容易完成的事情
口語·表示某事非常容易
英文釋義
something that is very easy to do or accomplish
例句
Don't worry about the math test; it was a piece of cake for me.
典故來源
源自20世紀美國俚語，可能源于輕松吃蛋糕的意象，比喻任務簡單易完成。