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。

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

　　中国人可以指望政府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 .