The discovery was something of a fluke.

这项发现多少有点侥幸。

《柯林斯英汉双解大词典》

Their streamlined bodies, the absence of hind legs, and the presence of a fluke and blowhole cannot disguise their affinities with land dwelling mammals.

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。

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The structure of the backbone shows, however, that Ambulocetus swam like modern whales by moving the rear portion of its body up and down, even though a fluke was missing.

不过，走鲸的脊椎结构显示，即使没有尾片，它们在水中同样能够像现代鲸鱼那样通过身体后面部分的上下摆动来游动。

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Well, let's make sure it's not a fluke.

让我确定一下这不是偶然。

麻省理工公开课 - 计算机科学及编程导论课程节选

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