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”

例句：

Don't worry about it. It's all in a day's work.
别担心，这没什么特别的，

Cooking is all in a day's work.
烧饭是常有的事儿。

All work and no play makes Jack 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”。

例句：
Go home! Remember: All work and no play makes Jack a dull boy.
快回家吧，要记住：只工作不玩耍，聪明的孩子也变傻。

I'm worried about him. He hasn't yet understood that all work and no play makes jack a dull boy.
我很担心他，他还没有明白过来，只工作不玩耍，聪明的孩子也变傻。

dirty work

Definition: Necessary, but uninteresting, or difficult work
这句话的意思是“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。

例句：
He did the dirty work on that project.
他在那个项目中做的是吃力不讨好的活儿。

Have you got around to doing the dirty work yet?
你已经在找时间做这个很无聊的工作了吗？

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。

例句：
Hey, let's get down to work here!
嘿，咱们该认真开始工作了！

Sorry, I've got to get off the phone and get down to work.
对不起，我必须放下电话开始工作了。

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

例句：
He got all worked up over the last exam.
他对上次考试非常生气。

Don't get worked up over the garden. I'll take care of it tomorrow.
别因为花园的事情生气了，我明天会搞定的。

make short work of something

Definition: do something quickly
含义是“很快完成”

例句：
I made short work of the assignment and moved on to the next job.
我很快的就完成了任务开始下一项工作了。

Give it to John. He'll make short work of it.
交给约翰吧，他会很快做完的。

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

例如：
Janet works like a horse!
珍妮特工作非常努力！
Why don't you ask Tom. He works like a horse.
为什么不问问汤姆，他工作非常努力。

work out for the best

Definition: eventually finish well
含义是最后完成得很好。

例句：
Don't worry about your problems. Everything will work out for the best.
别担心你的问题，所有的事情最后都会好的。

The divorce worked out for the best for the whole family.
对这个家庭来说，离婚是最后最好的结果。

work something off

Definition: lose weight
含义是减肥，减轻体重

例句：
I'm going running to work dinner off.
我要去跑步减肥。

She went to the gym to work off a few pounds.
她去健身房减掉几磅体重。

throw a monkey wrench in the works

Definition: cause a disturbance in something that seems clear and understandable
含义是把看上去很清楚明白的事情搅乱

例句：

I hate to throw a monkey wrench in the works, but don't you think we should ask Andy to help.
我讨厌把事情搅乱，但是你不认为我们应该找安迪帮忙吗？