271. Television violence has contributed directly to rising crime, as evidenced by statistics showing a dramatic rise in copycat crimes.
　　数据显示模仿的犯罪行为有大幅度的增加，这证明电视暴力是犯罪增加的一部分直接原因。

　　272. The introduction of advance agronomic techniques has contributed greatly to the development of agriculture, as indicated by statistics showing increased output in each of the past five years.
　　数据显示在过去的五年中，每一年的产量都有提高，这表明发达的农业技术的引入对农业发展起到了很大的作用。

　　273. While it may appear that the gap between rich and poor people is narrowing somewhat, recently released evidence suggests that the opposite is true.
　　贫富之间的差距看似有一定的缩小，但是最近发布的证据表明事实正好相反。

　　274. While attaining world peace remains within the realm of possibility, the prevailing trend revolves around regional conflicts and internal strife in many countries.
　　获得世界和平是有可能的，但是普遍的趋势是存在地区冲突和许多国家内部的斗争。

　　275. Although statistics are quite often far less reliable than one might wish, other reliable information allows one to closely approximate industrial output figures.
　　尽管数据经常比人们希望的不可靠得多，但是，其他可靠的信息使人们能得到接近工业产量的数字。

　　276. Although random sampling used for many surveys fails to cover large segments of the population, the procedure nonetheless offers insight into voting and consumption patterns.
　　虽然许多调查所用的随机取样不能覆盖大部分人口，但是这一过程使人们能更深刻地理解选举和消费的模式。

　　277. The need for more government services has proved to be the case time and again.
　　事实多次证明需要更多的政府服务工作。

　　278. The funny thing about marriage is that the newness soon wears off.
　　婚姻的一个可笑之处是新鲜感马上就没有了。

　　279. There are instances when one must abandon the tendency for self-prevention in order to assist a person in grave danger.
　　存在这样的情况：为了帮助处于严重危险中的人，一个人必需抛弃自保的倾向。

　　280. There are situations in which it's highly advisable for a person to control his/her temper and keep his/her mouth shut.
　　有些情况下，一个人控制住自己的脾气并保持沉默是明智的。