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

2. They were wearing similar suits.
    他们穿着同样的衣服.

3. This slender tree bends when the wind blows hard.
    刮大风时，这棵细长的树会被吹弯的。

4. They felt weary after all their hard work.
    他们把所有的累活儿都干完

5. The hard work was worthwhile because I passed the exam.
    我考试通过了，所以刻苦努力还是值得的。

6. Like the cooling of a hot kettle or the wearing-out of a pair of shoes.
    就像一壶热水迟早会凉不来，一双鞋渐渐会磨破一样。

7. This made the driver following her brake hard.
    她这一停使得跟在后头的司机也来个急刹车。

8. The ball struck him so hard that he nearly fell into the water.
    球重重地打在他身上，使他差点儿落入水中。

9. The operation, which lasted for over four hours, proved to be very difficult because of the hard resin which covered the skin.
    手术持续了4个多小时，非常难做，因为皮肤上覆盖着一层硬硬的树脂。

10. The man who I served was wearing a hat.
    我接待的那个人戴着一顶帽子。