小菜一碟 (Xiǎocài yìdié) a piece of cake

Usage:

“小菜一碟”的本义是指一小盘菜,比喻不重要的或者很容易做到的事情。
The original meaning of "小菜一碟" is a small dish. It is a metaphor of something that is not important or very easy to do.

Sentences:

1、Duì tā zhège jiàoshòu láishuō, xiě yì piān duǎnduǎn de lùnwén yīnggāi shì xiǎocài yìdié.
对他这个教授来说,写一篇短短的论文应该是小菜一碟。
As a professor, writing a short thesis must be a piece of cake for him.

2、Yǔ shàngcì de rènwu xiāngbǐ, zhècì de búguò shì xiǎocài yìdié.
与上次的任务相比,这次的不过是小菜一碟。
Compared with last task, this one is just a piece of pie.

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