Xiaocai yidie'r

　　小菜一碟儿

　　It's a piece of cake.

　　Notes:

　　We use this phrase to refer to something that is easy to do.

　　Example:

　　A: Ni hui yong kuaizi ma?

　　你会用筷子吗？

　　Do you know how to use chopsticks?

　　B: Xiaocai yidie'r.

　　小菜一碟儿。

　　It's a piece of cake.