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1·I can promise you one thing: whatever you choose to do for a career, if you work hard at it, eventually special things will happen.

我可以向你保证一件事：无论你选择什么职业，只要你努力工作，最终会有不一般的事情发生。

2·People tend to work hard at this stage of life.

人在这个人生阶段往往发奋努力。《牛津词典》

3·He began to work hard at it.

他开始为之努力。

4·Li Bai suddenly understood the importance of hard work, and he started to work hard at school.

李白突然明白了努力学习的重要性，他开始在学校努力学习。

5·My parents have always told me how important it is to work hard at school and enter university.

父母一直告诫我在学校好好学习上大学是多么重要。

6·Work hard at your lessons.

努力学功课。

7·Work hard at school!

在学校努力学习！

8·To begin with, you must work hard at your lessons and be fully prepared before the exam. Without sufficient preparation, you can hardly expect to answer all the questions correctly.

首先，你必须努力学习功课，并在考试前做好充分的准备。没有充分的准备，很难正确回答所有的问题。

9·Don't work hard at anything.

做事情不努力。

10·You could work hard at something without getting far at all.

你完全有可能努力工作却一事无成。