1. There were hopes, however, that the problem of the rabbit would become manageable.
    然而人们还是希望, 兔子的问题会有办法解决.

2. The difficulty of the problem is manifest.
    这问题的困难是明显的。

3. The use of narcotics by teenagers is a problem in many countries.
    许多国家都存在青少年服用麻醉剂问题。

4. There is no easy panacea for our complicated problem.
    没有简单易行的补救方法能解决我们复杂的问题。

5. The redundant labour in factories is a big problem.
    工厂的过剩劳力是个大问题。

6. The problem will be discussed at length in subsequent chapters.
    这个问题将在后面几章详细讨论。

7. This would solve the problem of ventilation, for if a train entered this tunnel, it would draw in fresh air behind it.
    这样就可以解决通风问题，因为如果一列火车开进隧道，它后面就会带进新鲜空气。

8. There were hopes, however, that the problem of the rabbit would become manageable.
    但是，已有希望解决兔子所带来的问题。

9. The problem now facing humanity is: What is going to be done with all this knowledge?
    现在人类面临的问题是：用这些知识去做什么？

10. The key to a solution of that problem lay in an everyday observation.
    可以从我们的日常生活观察中找到这个问题的答案。