Piece of Cake 是个很普遍的小事情口语说法。跟中文里回复小事的用法一样：
A: Can you do it 你做的到吗?
B: Piece of cake 小事!
Learning English is a piece of cake.
很地道的简说是 Cake ：
Learning English is cake。
That was cake 那件事好容易
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