3L英语第四册lesson47

[ti:] [ar:] [al:] [by:] [00:02.00]喜欢tingclass.net，就把tingclass.net复制到QQ个人资料中！Lesson 47 [00:03.54]第47课 [00:05.08]Television Day:The sea [00:07.26]电视日:海洋 [00:09.44]If you looked at the Pacific from a space-capsule [00:11.91]如果你从宇宙飞船船舱观察太平洋, [00:14.38]you might think that the world was all water. [00:16.55]你也许会认为地球是一片海洋. [00:18.72]You would hardly be able to see any land at all. [00:21.04]你几乎看不到一点陆地. [00:23.37]Water covers most of the earth's surface. [00:25.64]地球表面的大部分是由水覆盖着的. [00:27.91]The sea contains a large number of substances,besides common salt. [00:31.04]海洋还含有大量的其他物质,除了盐以外. [00:34.16]If you boiled away some sea-water, [00:36.32]如果你把一些海水煮干, [00:38.49]you would find over forty different materials. [00:40.87]你就能发现有40多种物质. [00:43.25]For instance,out of a cubic mile of water [00:45.98]举例说,从一立方英里的水中 [00:48.71]you would get ninety-four tons of silver and three tons of gold. [00:52.23]就能提取94吨银子和3吨金子. [00:55.76]If it were possible to do this, [00:57.48]即使有可能这么做的话, [00:59.21]it still wouldn't be worth the trouble. [01:01.34]也不值得. [01:03.47]It would cost more to obtain these precious metals than they are worth. [01:06.29]要获取这些有价值的金属的成本要高于它们自身的价值. [01:09.11]But the sea provides us with a great many materials which we can obtain easily [01:12.49]不过,海洋为我们提供了大量的物质 [01:15.87]and which we use a lot. [01:17.85]我们易于获取并使用广泛的. [01:19.82]For instance,we use huge quantities of sand in industry to make glass, [01:23.80]例如,在工业上我们使用大量的沙子制作玻璃、 [01:27.79]detergents and cement. [01:29.71]洗涤剂和水泥. [01:31.63]Besides materials like salt and sand, [01:34.00]除了诸如盐和沙子这类物质外, [01:36.38]we obtain a great deal of food from the sea. [01:38.71]我们还从海洋中获取大量食物. [01:41.03]One day we may even have undersea farms. [01:43.66]有朝一日我们还能有海底农场呢? [01:46.28]We have hardly begun to explore the sea. [01:48.61]我们尚没有开始探索海洋 [01:50.93]In some ways it is less familiar than outer space. [01:53.80]从某些方面说,海洋比宇宙空间还要陌生.

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