1. The teacher exhorted him to work hard.
    教师谆谆告诫他要用功.

2. The seed has a hard exterior covering.
    这个种子的外壳很硬。

3. The focus on my camera isn´t working properly.
    我的照相机上的调焦装置有毛病.

4. The fundamental cause of his success is his hard work.
    他成功的根本原因是工作努力。

5. Their impregnable arguments are hard to rebut.
    他们牢不可破的论点很难被驳倒。

6. There was an old building at the back of the university where PierreCurie had been working.
    在皮埃尔.居里工作的那所大学后面有一所旧房屋.

7. They tried hard to prevent the war.
    他们力图防止战争。

8. This kind of original painting is hard to procure.
    这种油画的原作是不易弄到的。

9. Their impregnable arguments are hard to rebut.
    他们牢不可破的论点很难被驳倒。

10. The recondite treatise is hard to understand.
    这篇深奥的论文很费解。