它们的身体呈流线型，后肢完全消失，身体上长出了尾片和喷水孔，所有这些特征都无法掩饰它们与陆生哺乳动物之间的亲缘关系。
Their streamlined bodies, the absence of hind legs, and the presence of a fluke and blowhole cannot disguise their affinities with land dwelling mammals.
和水生动物不同，陆生动物的感官场建立在视觉的基础上，可以延展好几百米远，因此它们有时间考虑各种行动并选择最好的一种。
In contrast to aquatic life, land-based animals, whose vision-based sensory field extends for hundreds of meters, have time to contemplate a variety of actions and pick the best one.
我是世界上最大的陆生食肉动物之一，我也是家族中个头最大的成员。
I am one of the world's largest land predators. I'm also the biggest member of my family.
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