All work and no play makes Jack¹ a dull boy.
Definition: Idiom meaning that you need to have fun in order to be a happy, healthy person. 这句话就是传说中的“只工作不玩耍，聪明的孩子也变傻”。

all in a day's work
Definition: nothing special, part of the routine. 这句话的意思是“没什么特别的，司空见惯”。

dirty work
Definition: Necessary, but uninteresting, or difficult work. 意思是“必须要做的但很无聊或很难的工作”，其实也就是做苦工，或者是吃力不讨好的工作。

get down to work
Definition: Stop relaxing, focus on important task. 这句话的意思是不再放松，开始做重要的事情，完成重要的任务。

get worked up over something
Definition: become angry or annoyed about something. 含义是对什么事情感到生气、恼怒。

make short work of something
Definition: do something quickly. 含义是“很快完成”。

work like a horse
Definition: work a lot, work very hard. 含义是辛勤工作，非常努力的工作。

work out for the best
Definition: eventually finish well. 含义是最后完成得很好。

work something off
Definition: lose weight. 含义是减肥，减轻体重。

throw a monkey wrench² in the works
Definition: cause a disturbance³ in something that seems clear and understandable. 含义是把看上去很清楚明白的事情搅乱。