Because its eyeball is fixed, the whale must move its huge body to shift its line of sight.

　　鲸鱼的眼球是固定的，它必须移动巨大的身体才能改变其视线。


　　A whale's heart beats only nine times a minute.

　　鲸鱼的心脏每分钟只搏动9次。


　　No one has ever been able to domesticate the African elephant. Only the Indian elephant can be trained by man.

　　从来没有人能驯服非洲象。只有印度象能接受人的训练。


　　The bat is the only mammal that can fly.

　　蝙蝠是唯一会飞的哺乳动物。

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