It's a piece of cake 小菜一碟
例句：
Never say die,it's a piece of cake.
不要放弃，它就是小菜一碟。
I guess it's a piece of cake for you.
我想这对你来说就是小菜一碟。
A:I can't believe you solve this math problem in 30 seconds.
B:Well,It's a piece of cake.
背景音乐：
I got it-Jack Johnson
