1. Even if human cloning offers no obvious benefits to mankind, why ban it?
    即使克隆人类不会给人类提供任何明显的好处，可为什么要禁止它？

2. But in an old man who has known human joys and sorrows, and has achieved whatever work it was in him to do,
    可是老年人已经饱尝了人间的甘苦，一切能做的都做了，

3. Because they destroy so many insects, and insects include some of the greatest enemies of the human race.
    因为它们能消灭那么多的昆虫，其中包括一些人类的大敌。

4. Beauty in terms of our human meanings is meaningless.
    用对我们人类有意义的词解释美是没有意义的。

5. Broadly speaking, human beings may be divided into three classes:
    泛泛地说，人可以分为3类：

6. Both these ships set out from Shanghai on June 18th, 1872 on an exciting race to England.
    两船于1872年6月18日同时从上海启航驶往英国，途中展开了一场激烈的比赛。

7. Beggars almost sell themselves as human beings to arouse the pity of passers-by.
    乞丐出售的几乎是他本人，以引起过路人的怜悯。

8. But investigators were not satisfied with the answer: they still did not know what agent brought plasmodium to human beings.
    但是调查者对答案并不满意：他们仍不知道是什么媒介物把疟原虫带给了人类。

9. But scientists were reluctant to experiment on human beings when the results could be so serious.
    但是科学家们不愿意用人来做实验，因为结果会很严重。

10. But the human body attacks and destroys tissue from other species.
    但是人体会攻击并破坏来自其他物种的组织。