21. 考慮到問題的嚴重性，在事態進一步惡化之前，必須采取有效的措施。

In view of the seriousness of this problem, effective measures should be taken before things get worse.

22. 在過去的幾十年，先進的醫療技術已經使得人們比過去活的時間更長成為可能。

In the last decades, advances in medical technology have made it possible for people to live longer than in the past.

23. 我們應該不遺余力地美化我們的環境。

We should spare no effort to beautify our environment.

24. 人們相信擁有計算機技術可以獲得更多工作或提升的機會。

People believe that computer skills will enhance their job opportunities or promotion opportunities.

25. 我同意后者，有如下理由：

For my part, I agree with the latter opinion for the following reasons:

26. 在給出我的觀點之前，我想看看雙方的觀點是重要的。

Before giving my opinion, I think it is important to look at the arguments on both sides.

27. 這一觀點正受到越來越多人的質疑。

This view is now being questioned by more and more people.

28. 環境學家指出：持續增加的污染不僅會導致像全球變暖這樣嚴重的問題，而且還將威脅到人類在這個星球的生存。

Environmental experts point out that increasing pollution not only causes serious problems such as global warming but also could threaten to end human life on our planet.

29. 考慮到這些嚴重的狀況，我們比以往任何時候更需要像自行車這樣的環保型交通工具。

In view of such serious situation, environmental tools of transportation like bicycle are more important than any time before.

30 盡管自行車有許多明顯的優點，但是它也存在它的問題。

Despite many obvious advantages of bicycle, it is not without its problem.