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.
传统上，物种的亲缘关系是通过对它们的解剖结构的密切比较来确定的。
Traditionally the relatedness of species has been ascertained by a close comparison of their anatomy.
卡尔·伍斯颠覆了我们之前对地球上所有不同物种亲缘关系的看法。
Carl Woese has completely changed the way we view the relationships between all organisms on earth.
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