5an instructor demonstrates water combat techniques to prospective SEALs. The sailors then pair off, and practice the technique in a pool.

教官在给准海豹队员们演示水下的作战技巧。然而队员们分别开始捉对撕杀，在池中演练实战技术。

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"When I was growing up so many people learned kungfu, but that's no longer the case," said Leung Ting, 69, who has been teaching wing chun, a close-combat technique, for 50 years.

“我长大那时候，人人都练功夫。但现在时代不同了，”69岁的梁挺说，他教授近距离打斗技巧咏春拳已经50年了。

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The ancient inhabitants of Amazonia knew how to keep fragile soils fertile—and may have hit upon a way to combat present-day climate change. That technique?

亚马逊古老大陆的先民们知晓如何让脆弱的土壤保持肥力————这可能在不经意中发现一种应对眼前的气候变化的方法。

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