The math test was a piece of cake.

这次数学考试非常简单。

Cooking this dish is a piece of cake if you follow the recipe.

如果你按照食谱做，这道菜非常容易。

For her, running a marathon is a piece of cake.

对她来说，跑马拉松是轻而易举的事。

Solving this puzzle was a piece of cake for him.

对他来说，解决这个谜题非常简单。

Once you understand the instructions, assembling the furniture is a piece of cake.

一旦你理解了说明，组装家具就是小菜一碟。