Lesson 7 Bats英語對話,新概念英語第四冊,英語Lesson 7 Bats對白,Lesson 7 Bats英文怎麽說

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Lesson 7 Bats用英語怎麽說

新概念英語第四冊

Lesson 7 Bats

1 . 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.不僅能夠確定魚群的位置,而且可以根據魚群回聲的特點分辨出是鯡魚、鱈魚,這是人們所熟悉的其他魚。

2 . So it is a comparatively simple step from locating the sea bottom to locating a shoal of fish.從測定海深到測定魚群,這一進展比較容易。

3 . To get a full appreciation of what this means we must turn first to some recent human inventions.要透徹理解這句話的意義,我們應先回顧一下人類最近的幾項發明。

4 . So was born the echo-sounding apparatus, now in general use in ships.這樣就產生了目前各種船舶上普遍應用的回聲探測儀。

5 . they can locate and steer clear of obstacles -- or locate flying insects on which they feed.並能通過回聲來確定並躲開障礙物,或找到它們賴以為生的昆蟲。

6 . This echo-location in bats is often compared with radar, the principle of which is similar.蝙蝠這種回聲定位常常可與雷達相比較,其原理是相似的。

7 . A sound made by tapping on the hull of a ship will be reflected from the sea bottom,敲打船體所發了的聲音會從海底傳回來,

8 . Not all sounds made by animals serve as language.動物發出的聲音不都是用作語言交際。

9 . It has been found that certain bats emit squeaks and by receiving the echoes,人們發現,某些蝙蝠能發出尖叫聲,

10 . Every solid object will reflect a sound, varying according to the size and nature of the object.任何固體者反射聲音,反射的聲音因物體的大小和性質的不同而不同。

11 . 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.我們只要看一看蝙蝠回聲定位這一極不尋常的發現,就可以探究一下聲音在什麼情況下有絕對的實用價值。

12 . The further off this solid obstruction, the longer time will elapse for the return of the echo.固體障礙物越遠。回聲返回所用時間就越長。

13 . With experience, and with improved apparatus,根據經驗和改進了的儀器,

14 . A shoal of fish will do this.魚群也反射聲音。

15 . 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.測出回聲間隔的時間,便可算出該處海洋的深度。

16 . 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,在牆壁或山腰附近發出的喊聲,就會聽到回聲。

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