Lesson 57     The Elephant and the Whale     The biggest and strongest animal on land is the elephant. The largest and heaviest animal in the sea is the whale. It's also the biggest eater in the world. It eats a ton of food a day. It looks like a fish, but it is really a mammal. Although the elephant and the whale are both mammals, they are indeed very different.     大象与鲸鱼     陆地上最大，最壮的动物就是大象。海中最大、最重的动物则是鲸鱼，它也是世界上吃得最多的动物，它每天要吃一吨的食物。它看起来像鱼，但它实际上是哺乳动物。虽然大象和鲸鱼都是哺乳动物，它们却大不相同。  

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