038慢速英语字幕(4)

慢速英语字幕,练习听力用得上

to build a clock that would help sailors learn longitude. His task also was difficult and complex. Mister Harrison had to develop a clock that was not affected by the movement of a ship on the ocean or changes in temperature or (22) atmospheric pressure.

He began developing his clock in Seventeen-Thirty. It took five years to complete. The complex device weighed thirty-four kilograms. Several years later, Mister Harrison built a second clock. It was smaller, but weighed more than the first. Mister Harrison was not satisfied and began work on another device.

Twenty years, later he completed a device that was smaller than the first two, and weighed less. But, still Mister Harrison was not satisfied.

Two years later, in Seventeen-Fifty-Seven, he produced a small clock that he could hold in his hand. The clock could tell the correct time in two places, meeting the requirements for learning longitude on the sea.

VOICE ONE:

For many years after Mister Harrison's work was completed, the idea of using a clock to learn longitude was rejected. However, that opinion changed when (23) manufacturers learned how to make better and less costly (24) versions of Mister Harrison's clocks. The clocks became known as (25) chronometers. By Eighteen- Fifteen, five-thousand chronometers were in use on ships sailing the world's oceans. The complex documents and mathematical work were no longer necessary. Almost any sailor could tell what his longitude was by simply looking at a clock. The world had changed.

VOICE TWO:

John Harrison's clocks can be seen today at the Old Royal (26) Observatory in

(27) Greenwich, England. The first three are still operating, showing the correct time. To look at them is to see the simple solution to a problem that worried people for many centuries. Today, the solution to the problem is so common that it is difficult to understand that there was a problem at all.

(((THEME)))

VOICE ONE:

This program was written by Oliver Chanler and produced by Paul Thompson. This is Steve Ember.

VOICE TWO:

And this is Bob Doughty. Join us again next week for EXPLORATIONS, a program in Special English on the Voice of America.

(1) navy [ ] n.海军

(2) drown [ ] vt.淹没

(3) navigator [ ] n.航海家

(4) compass [ ] n.指南针

(5) device [ ] n. 设备

(6) magnetic north pole 磁北极

(7) imaginary [ ] adj.假想的, 想象的, 虚构的

(8) equator [ ]n.赤道, 赤道似的圈.圆

(9) parallel [ ] adj.平行的

(10) latitude [ ] n.纬度, 范围, (用复数)地区, 行动或言论的自由(范围)

(11) astronomer [ ] n.天文学家

(12) longitude [ ] n.经度, 经线

(13) revolution [ ] n.旋转

(14) stretch [ ] v.伸展, 伸长

(15) decrease [ ] v.减少

搜索“diyifanwen.net”或“第一范文网”即可找到本站免费阅读全部范文。收藏本站方便下次阅读，第一范文网，提供最新经管营销038慢速英语字幕(4)全文阅读和word下载服务。