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 adcance 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************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。

　　281. Gone are the days when Chinese people could expect cradle to death support from the government .

　　中国人可以指望************提供从出生到死亡的资助的日子已经不复存在了。

　　282. The days when one could safely walk city streets at night are gone .

　　一个人可以在夜里安全地走在城市街道上的日子已经过去了。

　　283. China's population almost doubled to 1.2 billion people during the 1955-1995 , according to the National Census Bureau .

　　根据全国人口普查局的数据，中国人口在1955年至1995年期间几乎翻了一番，增加到12亿。

　　284. A report by the Department of Education estimates that the student-teacher ratio in China is four times higher than in the United States .

　　教育部的一份报告估计中国的学生和老师的比例比美国高四倍。

　　285. Official figures released by the Ministry of Transportation show that motor vehicle fatalities have more than tripled since 1995 .

　　交通部公布的官方数据表明机动车死亡事故从1995年起已经翻了两番多。