fluke

The discovery was something of a fluke.

这项发现多少有点侥幸。

They are determined to show that their last win was no fluke.

他们决心证明他们上一次的胜利绝非侥幸。

The whale retained a tail and lacked a fluke, the major means of locomotion in modern cetaceans.

这种鲸保留了尾巴，没有现代水生鲸类动物用于行动的主要部位，尾片。

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。

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。