18. Working with the disabled cannot help but leave one impressed with their indefatigable desire .

　　与残疾人一起工作使一个人不得不对他们坚持不懈的渴望印象深刻。

　　19. Perhaps no issues are more controversial than euthanasia and abortion , both of which involve taking the life of a human being .

　　也许没有问题比安乐死和人工流产更有争议性，它们都涉及结束一个人的生命。

　　20. Never before in history has the issue of overpopulation been more evident than now .

　　历史上，人口过剩的问题从来没有比现在更加突出。

　　21. Perhaps it is time to reexamine the idea that college degrees are a guarantee of intelligence .

　　也许现在是应该重新考虑大学为是智力的保证这种想法的时候了。

　　22. A growing number of people are beginning to realize that wealth is not the sole prerequisite for happiness .

　　越来越多的人开始意识到财富不是幸福的惟一先决条件。

　　23. In spite of the extraordinary progress made in science and technology , problems remain in terms of guaranteeing that

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　　achievements benefit the greatest number of people .

　　尽管科学技术取得了非凡的进步，但是在保证进步成果使尽可能多的人受益这方面还存在一些问题。

　　24. A famous thinker once wrote that " the greatest threat to mankind is mankind itself ! " If this is indeed the case , then the current situation should make us ponder our futuer existence .

　　一位著名的思想家曾经写道：“对人类最大的威胁是人类自身!”如果事实确实如此，那么，现状应该促使我们对我们未来的生存进行思索了。

　　25. U.S. President Harry Truman once remarked : " The buck stops here ! " His view has been confirmed by numerous world leaders who have assumed full responsibility for their actions .