It's a piece of cake 小菜一碟
例句：
Never say die,it's a piece of cake.
不要放棄，它就是小菜一碟。
I guess it's a piece of cake for you.
我想這對你來說就是小菜一碟。
A:I can't believe you solve this math problem in 30 seconds.
B:Well,It's a piece of cake.
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