a piece of cake
指一件很容易完成的任务或者是工作，小菜一碟
I expected the English test to be difficult but it was a piece of cake.
我以为英语考试很难，但是不过就是小菜一碟
cool as a cucumber
（尤指在困难情形下）镇定自若。黄瓜口感清爽让人感觉平静，像黄瓜一样让人感觉平静
She looks efficent and as cool as a cucumber.
她外表看起来沉着冷静、镇定自若。
cucumber /ˈkjuːkʌmbə(r)/ 黄瓜 cool 沉着的，冷静的
bring home the bacon
挣钱养家，谋生
Since her father was injured, she has been working two jobs to bring home the bacon.
父亲受伤后，她就做了两份工作来养家糊口 bacon /ˈbeɪkən/ 熏猪肉
in hot water
（因做错事）陷入困境
She got herself in hot water with the authorities.
eat like a horse
吃得很多
She may be shin,but she eats like a horse.
她或许瘦了点，但吃得却很多。
eat like a bird就是反义词，吃得极少
you can't compare apples and oranges
因两样事物完全不同，不具可比性，不能相提并论
They are both great but you can't compare apples and oranges.
他们两个都很不错，但是不可相提并论。
not one's cup of tea
非某人所好，不合某人心意
He's nice enough but not really my cup of tea.
