16. There is a growing worldwide awareness of the need for strengthened environmental protection .
世界上越来越多的人认识到加强环境保护的必要性。
17. There has been a dramatic increase in the spread of HIV/AIDS in recent years ， with a new study projecting that the dreaded disease will affect over 30 million people worldwide by the year 2005 .
近年来，艾滋病蔓延的幅度进一步扩大，一项新的研究预测，到2005年，世界上有超过三千万人将感染这一可怕的疾病。
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。