It's a piece of cake It's a piece of cake： a thing that is very easy to do 轻而易举的事；举手之劳；小意思 I guess it's a piece of cake for you. 我想这对你来说就是小菜一碟/小意思。 A:I can't believe you solve this math problem in 30 seconds. 我不敢相信你30秒就解出了这道数学题。 B:Well,It's a piece of cake. 小菜一碟/小意思。