小菜一碟的英文：
a piece of cake

参考例句：

The hardest part of the mission passed, and the rest is just a piece of cake.
任务中最难的部分已经结束了，剩下的是小菜一碟啦。

piece是什么意思：
n. 片，段；件，个；篇；硬币
v. 修补；填补；拼凑，缝合
adj. 计件的

a piece of flesh
娘儿们|女人|人

A piece of cake
小事一桩

Then It'started to break into pieces. These pieces started to move apart.
然后它开始分为很多块。这些分开的板块开始移动，分开。

How do you finger this piece?
这段曲子怎么弹？

This piece of cloth has a new design.
这布图案新颖。

cake是什么意思：
n. 蛋糕；饼；块状物
v. 使结块，加块状物于；结块

A piece of cake
小事一桩

For dessert, we have fruit cake, cream cake and chestnut cake.
至于甜食，我们有水果蛋糕、奶油蛋糕和栗子蛋糕。

The knife easily cut into the cake.
刀一下子就切进了蛋糕。

The cakes were displayed in the window.
糕点陈列在橱窗中。

Dust sugar on to a cake.
将糖撒在糕点上。