💬 新概念英语第四册
共 1204 条英汉对照例句 · 第 4 页
Lesson 7 Bats
Not all sounds made by animals serve as language.
动物发出的声音不都是用作语言交际。
Lesson 7 Bats
and we have only to turn to that extraordinary discovery of echo-location in bats to see a case in which the voice plays a strictly utilitarian 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。
Lesson 7 Bats
To get a full appreciation of what this means we must turn first to some recent human inventions.
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。
Lesson 7 Bats
Everyone knows that if he shouts in the vicinity of a wall or a mountainside, an echo will come 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。
Lesson 7 Bats
The further off this solid obstruction, the longer time will elapse for the return of the echo.
固体障碍物越远。回声返回所用时间就越长。
Lesson 7 Bats
A sound made by tapping on the hull of a ship will be reflected from the sea bottom,
敲打船体所发了的声音会从海底传回来，
Lesson 7 Bats
and by measuring the time interval between the taps and the receipt of the echoes, the depth 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。
Lesson 7 Bats
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。
Lesson 7 Bats
Every solid object will reflect a sound, varying according to the size and nature of the object.
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。
Lesson 7 Bats
A shoal of fish will do this.
鱼群也反射声音。
Lesson 7 Bats
So it is a comparatively simple step from locating the sea bottom to locating a shoal of fish.
从测定海深到测定鱼群，这一进展比较容易。
Lesson 7 Bats
With experience, and with improved apparatus,
根据经验和改进了的仪器，
Lesson 7 Bats
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。
Lesson 7 Bats
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，
Lesson 7 Bats
they can locate and steer clear of obstacles -- or locate flying insects on which they feed.
并能通过回声来确定并躲开障碍物，或找到它们赖以为生的昆虫。
Lesson 7 Bats
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。
Lesson 8 Trading standards
Chickens slaughtered in the United States, claim officials in Brussels, are not fit to grace European tables.
布鲁塞尔的官员说，在美国屠宰的鸡不适于用来装点欧洲的餐桌。
Lesson 8 Trading standards
No, say the American: our fowl are fine, we simply clean them in a different way.
不，美国人说，我们的家禽很好，只是我们使用了另一种清洗方式。
Lesson 8 Trading standards
These days, it is differences in national regulations, far more than tariffs, that put sand in the wheels of trade between rich countries.
当前，是各国管理条例上的差异，而不是关税阻碍了发达国家之间的贸易。
Lesson 8 Trading standards
It is not just farmers who are complaining.
并不仅仅是农民在抱怨。
Lesson 8 Trading standards
An electric razor that meets the European Union's safety standards must be approved by American testers before it can be sold in the United States,
一把符合欧洲联盟安全标准的电动剃须刀必须得到美国检测人员的认可，方可在美国市场上销售；
Lesson 8 Trading standards
and an American-made dialysis machine needs the EU's okay before is hits the market in Europe.
而美国制造的透析仪也要得到欧盟的首肯才能进入欧洲市场。
Lesson 8 Trading standards
As it happens, a razor that is safe in Europe is unlikely to electrocute Americans.
碰巧在欧洲使用安全的剃须刀不大可能使美国人触电身亡，
Lesson 8 Trading standards
So, ask businesses on both sides of the Atlantic, why have two lots of tests where one would do?
因此，大西洋两岸的企业都在问，当一套测试可以解决问题时，为什么需要两套呢？
Lesson 8 Trading standards
Politicians agree, in principle,
政治家在原则上同意了， 因此，
Lesson 8 Trading standards
so America and the EU have been trying to reach a deal which would eliminate the need to double-test many products.
美国和欧洲一直在寻求达成协议，以便为许多产品取消双重检查。
Lesson 8 Trading standards
They hope to finish in time for a trade summit between America and the EU on May 28TH.
他们希望尽早达成协议，为5月28日举行的美国和欧洲贸易的最高通级会议作准备。
Lesson 8 Trading standards
Although negotiators are optimistic, the details are complex enough that they may be hard-pressed to get a deal at all.
然谈判代表持乐观态度，但协议细节如此复杂，他们所面临的困难很可能使他们无法取得一致。
Lesson 8 Trading standards
Why? One difficulty is to construct the agreements.
为什么呢？困难之一是起草这些协议。
Lesson 8 Trading standards
The Americans would happily reach one accord on standards for medical devices and them hammer out different pacts covering,say,
美国人很愿意就医疗器械的标准达成一个协议，然后推敲出不同的合同，用以涵盖 --比如说