He must have worked hard at it.
他一定下过很大的功夫。
不要太辛苦工作。
Most of us need to work hard at it.
实际上，我们大多数人都需要勤奋努力地练习。
I studied art and worked hard at it.
我学艺术，而且很用功。
她努力地学习它。
They worked very hard at it, but in vain.
他们在这项工作上下了很大功夫，但是不起作用。
We must work hard at it until we succeed.
一定要坚持不懈的努力直到成功！
I've been working hard at it and I made it.
我一直在努力，还真干成了。
They were hard at it with brooms and mops.
他们忙着用扫帚和拖把打扫卫生。
我努力工作。
I was hard at it, but I have little progress.
我在它上面努力了，但我取得的进步很小。
My English is very poor, so I will work hard at it.
我的英语水平很差，所以我得努力学习它。
My English is very poor, so I must work hard at it.
我的英语很差，所以我得努力学习它。
No matter what your job is, you should work hard at it.
不管你的工作是什么，你都需要努力工作。
We can improve our English as long as we work hard at it.
只要我们在英语学习上下功夫，就能提高英语水平。
When you really like what you're doing, you work very hard at it.
当你确实喜欢你所做的事情时，你就会很卖力地去做。
You can make great progress in your English if you work hard at it.
如果你努力学习，你就会在英语方面取得很大进步。
Our English teacher is very strict with us. We all work hard at it.
我们的英语老师对我们要求很严，我们都很努力的学英语。
English is becoming more and more important. We must work hard at it.
英语变得越来越重要了，我们必须努力学好它。
Some people dream of success while others wake up and work hard at it.
有些人还在继续梦想成功时，另一些人却已经醒来努力为之奋斗了。
Thanks for your compliment. I've been working hard at it and I made it.
谢谢你的夸奖。我一直在努力，还真做成了。
Some people dream of success, while others wake up and work hard at it.
有些人梦想成功，有些人则是在梦醒之后为此努力拼搏。
It's impossible to learn a foreign language without working hard at it.
不下工夫就能学会外语是不可能的。
If you want to make money or build your business, you need to work hard at it.
如果你想赚钱又或者开创自己的生意，你需要努力地为之工作。
The policemen were already hard at it when we reached the scene of the accident.
当我们到达肇事地点时，警察们已经在哪里忙开了。
There is no easy way to learn English well, you'll just have to work hard at it.
学好英语不是轻而易举的事，谁都得下苦功夫。
We must believe that each one of us is able to do something well and that when we discover what this something is, we must work hard at it until we succeed.
我们必须相信我们每一个人都能把某件事情办好，而且当我们发现这件事情是什么的时候我们必须努力干下去，直到成功为止。
We must believe that each one of us is able to do something well and that when we discover what this something is, we must work hard at it until we succeed.
我们必须相信我们每一个人都能把某件事情办好，而且当我们发现这件事情是什么的时候我们必须努力干下去，直到成功为止。
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