The current is swiftest in the middle of the river.

河当中水流最急。

《新英汉大辞典》

The grouse season opens in Britain, but which game bird can make the swiftest escape?

英伦松鸡狩猎季节开始，哪种猎禽能胜利大逃亡？

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Yet the grouse, although it may swoop and jink to avoid a peppering of pellets, is far from the swiftest bird that might beat a retreat from the shotguns.

尽管松鸡的俯冲和急转可能会躲过子弹网状般的扫射，但它远非速度最迅捷的鸟，能从枪下“漏网”逃生。

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The reason for that I think is that the early times in which these civilizations arose saw all kinds of dangers coming, and the most--the swiftest, the least suspected, the one that could come upon you overnight came from the sea.

在我看来原因是,在这些文明所诞生的早期世界危机四伏,而来的最迅速,最难以预测,最可能,一夜之间骤然降临的灾难,正来自于海上

耶鲁公开课 - 古希腊历史简介课程节选

But they are a conservative bunch at the ECB and not the swiftest in making changes.

FORBES: A 'Yen' For Your Thoughts

The 28-year-old American simply ran away from the swiftest the rest of the world had to offer.

CNN: THE OUTSTANDING PERFORMANCE

Capitalism is a system wherein capital, i.e. money and credit, finds the smartest and swiftest businesses or entrepreneurs.

FORBES: Keep Geniuses Out of the Post Office