参考： 鲸是海洋哺乳动物中鲸目生物的俗名，又分为齿鲸类和须鲸类，鲸目之下包括有海豚科。 The whale is the cetacean marine mammals in the name, and is divided into toothed whales and baleen whales, including dolphins under cetacea. 鲸生活在海洋中。鲸的表皮下有极厚的脂肪层，即鲸油，它可以使鲸体保持温暖，而且也能贮存能量以供应不时之需。由于鲸鱼体内拥有许多特殊的构造，使它能够长时间的在水中屏住呼吸、减缓心跳速度，因此当它沉到海底，总要经过一段长时间后才会再浮出水面。除了具有贮存氧气的构造外，当身体某个部位需要大量的血液供应时，体内会有集中供应的特殊机能。 Whales live in the ocean. The whale skin thick layer of fat, blubber, it can render whales body to keep warm, but also can store energy to supply a rainy day. Because whale has a lot of special structure, so that it can hold your breath for a long time in the water, slow down the heart rate, so when it sank to the bottom of the sea, always after a long period of time before the surface. In addition to the structure with the storage of oxygen, when the body needs a large number of parts of the blood supply, the body will have a special function of centralized supply.
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