[by:英语听力网|http://yingyu.chazidian.com||查字典英语网] [00:00.00]喜欢chazidian.com，就把chazidian.com复制到QQ个人资料中！Lesson 47 [00:01.54]第47课 [00:03.08]Television Day:The sea [00:05.26]电视日:海洋 [00:07.44]If you looked at the Pacific from a space-capsule [00:09.91]如果你从宇宙飞船船舱观察太平洋, [00:12.38]you might think that the world was all water. [00:14.55]你也许会认为地球是一片海洋. [00:16.72]You would hardly be able to see any land at all. [00:19.04]你几乎看不到一点陆地. [00:21.37]Water covers most of the earth's surface. [00:23.64]地球表面的大部分是由水覆盖着的. [00:25.91]The sea contains a large number of substances,besides common salt. [00:29.04]海洋还含有大量的其他物质,除了盐以外. [00:32.16]If you boiled away some sea-water, [00:34.32]如果你把一些海水煮干, [00:36.49]you would find over forty different materials. [00:38.87]你就能发现有40多种物质. [00:41.25]For instance,out of a cubic mile of water [00:43.98]举例说,从一立方英里的水中 [00:46.71]you would get ninety-four tons of silver and three tons of gold. [00:50.23]就能提取94吨银子和3吨金子. [00:53.76]If it were possible to do this, [00:55.48]即使有可能这么做的话, [00:57.21]it still wouldn't be worth the trouble. [00:59.34]也不值得. [01:01.47]It would cost more to obtain these precious metals than they are worth. [01:04.29]要获取这些有价值的金属的成本要高于它们自身的价值. [01:07.11]But the sea provides us with a great many materials which we can obtain easily [01:10.49]不过,海洋为我们提供了大量的物质 [01:13.87]and which we use a lot. [01:15.85]我们易于获取并使用广泛的. [01:17.82]For instance,we use huge quantities of sand in industry to make glass, [01:21.80]例如,在工业上我们使用大量的沙子制作玻璃、 [01:25.79]detergents and cement. [01:27.71]洗涤剂和水泥. [01:29.63]Besides materials like salt and sand, [01:32.00]除了诸如盐和沙子这类物质外, [01:34.38]we obtain a great deal of food from the sea. [01:36.71]我们还从海洋中获取大量食物. [01:39.03]One day we may even have undersea farms. [01:41.66]有朝一日我们还能有海底农场呢? [01:44.28]We have hardly begun to explore the sea. [01:46.61]我们尚没有开始探索海洋 [01:48.93]In some ways it is less familiar than outer space. [01:51.80]从某些方面说,海洋比宇宙空间还要陌生.