新概念第四册句子精粹 Lesson7:蝙蝠

2014-04-16 16:51:00来源:网络

  新概念一直被视为英语学习的经典教材,新概念英语第四册课文对原有教学法进行调整,更利于学生加强交际能力。每课书相对独立,利于同学们自学。为了让同学们能够更加全面完善的学习新概念英语,新东方在线英语组老师将帮助同学们一起总结知识点~

  课文7 蝙蝠

  104. Not all sounds made by animals serve aslanguage,

  动物发出的声音不都是用作语言交际。

  105. and we have only to turn to thatextraordinary discovery of echo-location in bats tosee a case in which the voice plays a strictlyutilitarian role.

  我们只要看一看蝙蝠回声定位这一极不寻常的发现,就可以探究一下声音在什么情况下有绝对的实用价值。

  106. To get a full appreciation of what this means we must turn first to some recent humaninventions.

  要透彻理解这句话的意义,我们应先回顾一下人类最近的几项发明。

  107. Everyone knows that if he shouts in the vicinity of a wall or a mountainside, an echo willcome back.

  大家都知道,在墙壁或山腰附近发出的喊声,就会听到回声。

  108. The further off this solid obstruction, the longer time will elapse for the return of theecho.

  固体障碍物越远。回声返回所用时间就越长。

  109. A sound made by tapping on the hull of a ship will be reflected from the sea bottom,

  通过敲击空船发出的声音将会从海底反射回来。

  110. and by measuring the time interval between the taps and the receipt of the echoes, thedepth of the sea at that point can be calculated.

  测出回声间隔的时间,便可算出该处海洋的深度。

  111. So was born the echo-sounding apparatus, now in general use in ships.

  这样就产生了目前各种船舶上普遍应用的回声探测仪。

  112. Every solid object will reflect a sound, varying according to the size and nature of theobject.

  任何固体者反射声音,反射的声音因物体的大小和性质的不同而不同。

  113. A shoal of fish will do this.

  鱼群也反射声音。

  114. So it is a comparatively simple step from locating the sea bottom to locating a shoal offish.

  从测定海深到测定鱼群,这一进展比较容易。

  115. With experience, and with improved apparatus,

  根据经验和改进了的仪器,

  116. it is now possible not only to locate a shoal but to tell if it is herring, cod, or other well-known fish, by the pattern of its echo.

  不仅能够确定鱼群的位置,而且可以根据鱼群回声的特点分辨出是鲱鱼、鳕鱼,这是人们所熟悉的其他鱼。

  117. It has been found that certain bats emit squeaks and by receiving the echoes,

  人们发现,某些蝙蝠能发出尖叫声,并能通过回声

  118. they can locate and steer clear of obstacles -- or locate flying insects on which they feed.

  来确定并躲开障碍物,或找到它们赖以为生的昆虫。

  119. This echo-location in bats is often compared with radar, the principle of which is similar.

  蝙蝠这种回声定位常常可与雷达相比较,其原理是相似的。

  (暂不提供全文)

  祝各位同学考试顺利,取得好成绩。还在等什么,快来新东方在线学习吧~


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