高中英语人教版高二下04

[08:33.93]only because their blood contains a particular chemical.
[08:36.87]只是因为它们的血液中有一种特别的化学物质.
[08:39.81]In these oceans live huge numbers of a small fish just 5 cm long.
[08:43.83]在这些海洋中生活着大群众路线大群只有五厘米长的小鱼.
[08:47.86]These fish swim together,
[08:49.78]这些鱼成群结队地在水中游,
[08:51.70]often in a group that may be 4.5 metres thick and hundreds of metres long.
[08:56.02]通常一个鱼群可能有4.5米厚,几百米长.
[09:00.34]There may be 63,000 fish per cubic metre.
[09:03.53]每立方米大约有63000条鱼.
[09:06.72]These fish provide the main food for whales.
[09:09.34]这些鱼成了望鲸鱼的主要食物.
[09:11.97]A whale may eat a ton of them at a time,and may enjoy four meals a day.
[09:16.45]一头鲸鱼一次可以吃掉一吨这种鱼,并且一天可能吃四次.
[09:20.93]The squid lives in the dark at a great depth at the bottom of the ocean.
[09:25.11]鱿鱼住在海底很深很暗的地方.
[09:29.29]It can grow to a length of 15 metres.
[09:32.07]它可以长到15米长.
[09:34.85]It is eaten by a type of whale called the sperm whale,
[09:37.93]有一种叫巨头鲸的鲸鱼
[09:41.02]which is over 18 metres long.
[09:43.29]长度超过18米.
[09:45.56]The sperm whale does not feed on small fish like other whales.
[09:48.73]和其它鲸鱼不一样,巨头鲸是不以小鱼为食的.
[09:51.91]Instead it has teeth and feeds on squid.
[09:57.24]It can dive to a depth of 1,000 metres.
[10:00.22]相反,它有牙齿,就吃鱿鱼.它还可以潜入水下1000米不深入.
[10:03.19]On one ship which had equipment for measuring the depth of the water,
[10:06.73]在一艘装有测量水深设备有船上,
[10:10.27]the captain noticed a sperm whale diving to a depth of nearly 2,250 metres.
[10:15.25]船长发现一头巨头鱼潜入到将近2250米深处.
[10:20.23]How does the sperm whale manage to do this?
[10:22.50]巨头鲸为何能潜到这样深呢?
[10:24.77]When it dives,its heart slows to half its normal speed.
[10:28.10]它潜水时,它的心跳速度就减慢到正常心速的一半.
[10:31.43]By doing this the animal can hold its breath for a longer time.
[10:34.97]通过减慢心速,这种动物就能在较长的时间内屏住气.
[10:38.51]The head contains a lot of oil,and this is probably cooled at the same time.
[10:42.78]它的头部有很多油,在潜水时这种油很可能被冷却.
[10:47.05]At the bottom of the ocean it is completely dark.
[10:49.63]在海底是完全黑暗无光的.
[10:52.20]The sperm whale therefore has to look for the squid using sound waves.
[10:56.13]因此巨头鲸就只得利用声波来找鱿鱼.