Their streamlined bodies, the absence of hind legs, and the presence of a fluke and blowhole cannot disguise their affinities with land dwelling mammals. ① streamline /ˈstriːmlaɪn/ vt. 使成流线型 ② hind /haɪnd/ a. 后面的,在后的 ③ presence /ˈprezns/ n. 存在;出现 — 它们呈流线型的身体,后腿的消失,尾片和气孔的出现,这些特征都不能掩饰它们和陆生哺乳动物的相似之处。 ④ fluke /fluːk/ n. 尾片 ⑤ blowhole /ˈbloʊhoʊl/ n. (鲸头顶的)呼吸孔 ⑥ affinity /əˈfɪnəti/ n. (语言、生物等之间的)类同,近似

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