piece of cake 小菜一碟

The math test was a piece of cake. 数学测试很简单。

to go bananas 抓狂，歇斯底里

He went bananas. 他神经错乱了。

bring home the bacon 养家糊口

My husband brings home the bacon. 我丈夫赚钱养家。

have bigger fish to fry 另有要事

I couldn't attend the meeting, I had bigger fish to fry. 我没有出席会议，因为我有更重要的事。

That's the way the cookie crumbles. 预料之中

like two peas in a pod 形影不离，一模一样

They are like two peas in a pod. 他们整天腻在一起。

as red as a cherry 像樱桃一样红

Her cheeks were as red as cherry. 她的脸红的像樱桃。

eat like a horse 食量大如牛

My baby eats like a horse. 我的孩子吃得很多。

walk on eggshells 小心翼翼（不伤害某人）

I've been walking on eggshells around my boyfriend. 我一直小心翼翼地维护和男朋友的感情。

hard nut to crack 难以对付的事或人

He is a hard nut to crack. 他是一个很难相处的人。