17 The Longest Suspension Bridge in the World

名称：17 The Longest Suspension Bridge in the World
内容简介：
新概念英语第三册（英音）
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[00:01.47]Lesson 17
[00:03.50]The longest suspension bridge in the world
[00:13.40]How is the bridge supported?
[00:17.95]Verrazano, an Italian about whom little is known, sailed into New York Harbour in 1524 and named it Angouleme.
[00:29.02]He described it as 'a very agreeable situation located within two small hills in the midst of which flowed a great river.'
[00:38.01]Though Verrazano is by no means considered to be a great explorer, his name will probably remain immortal,
[00:46.03]for on November 21st, 1964, the longest suspension bridge in the world was named after him.
[00:54.67]The Verrazano Bridge, which was designed by Othmar Ammann, joins Brooklyn to Staten Island.
[01:02.86]It has a span of 4,260 feet.
[01:07.30]The bridge is so long that the shape of the earth had to be taken into account by its designer.
[01:14.34]Two great towers support four huge cables.
[01:18.83]The towers are built on immense underwater platforms made of steel and concrete.
[01:25.02]The platforms extend to a depth of over 100 feet under the sea.
[01:30.19]These alone took sixteen months to build.
[01:33.99]Above the surface of the water, the towers rise to a height of nearly 700 feet.
[01:40.43]They support the cables from which the bridge has been suspended.
[01:45.20]Each of the four cables contains 26,108 lengths of wire.
[01:52.20]It has been estimated that if the bridge were packed with cars, it would still only be carrying a third of its total capacity.
[02:00.57]However, size and strength are not the only important things about this bridge.
[02:06.98]Despite its immensity, it is both simple and elegant,
[02:11.17]fulfilling its designer's dream to creat 'an enormous object drawn as faintly as possible'.