a piece of cake
US /ə piːs əv keɪk/
UK /ə piːs əv keɪk/

成语
1.
小菜一碟, 轻而易举
something that is very easy to do
示例:
•
The exam was a piece of cake; I finished it in half the time.
考试非常简单;我用了一半的时间就完成了。
•
Learning to ride a bike was a piece of cake for him.
对他来说,学骑自行车轻而易举。
在 Lingoland 学习这个单词