a piece of cake或duck soup下面是例句：
It's nothing to shout about. It's a piece of cake for you.
没什么了不了起的，对你是小菜一碟。
That vocabulary test was duck soup.
那次词汇测试真是小菜一碟。
a piece of cake
或as easy as apple pie直译：和苹果派一样简单，哩语
It's just a peanut.
it's just a little case.
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