1. If there had not been a hard layer of rock beneath the soil, they would have completed the job in a few hours.
    如果不是因为土壤下面有一层坚硬的岩石，他们的营救工作仅用几个小时就可以完成了。

2. If they knew how difficult it was to drill through the hard rock, they would lose heart.
    如果他们知道了钻透那坚硬的岩石有多么困难，他们会丧失信心的。

3. It is very hard to realize just how big the Great Pyramid is.
    要弄清大金字塔到底有多大，是很困难的。

4. I had a hard time, but now spring has come, and I am quite happy.
    冬天真难熬，好在现在春天到了，我太高兴了。

5. I like my subject and I work very hard.
    我喜欢我的专业，学得很用功。

6. In these forests there are so many trees, and they grow so close together, that it is hard to move around.
    森林里树木繁茂，不易走动。

7. I am fully prepared for more hard work.
    我已做好一切准备，去迎接更多、更艰苦的学习。

8. It was hard to believe she was the mother of the young lad with her.
    很难相信她就是身旁那个小家伙的妈妈。

9. It was not the sort of bright yellow sun making everything lift up at the edges, almost in fear, that I was used to, but a pale yellow sun, as if the sun had grown weak from trying too hard to shine; but still it was sunny.
    这不是那种我所习惯的、使每一样东西的边缘几乎是颤巍巍地向上翘的那种金黄色的太阳，而是那种淡黄的、好象是一个因过分卖力地想发出灿烂的光芒而变得软弱无力的太阳，但它毕竟也是灿烂的。

10. I worked hard to meet the minimum standards set by the course and to complete assignments on time.
    我尽力达到课程的最低限度的要求，并按时完成作业。