A swimmer can't swim under water very long, because he must take a breath.

游泳的人不能在水下游太久，因为他必须呼吸。

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Nicknamed a "monster in the waves", he was the first man to swim under four minutes in the 400-meter freestyle.

绰号叫“水中怪物”的他，是第一个在400米自由泳中游进4分钟的人。

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Jim said he felt like an otter, since he loved to turn and twist in the deep pools and could swim under water a long ways.

吉姆则说他像一只水獭，因为他总是喜欢在深潭里翻滚、旋转，还能在水下呆很长时间。

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No one should swim alone and, if possible, always swim under the watchful eye of a certified lifeguard.

CNN: Water safety expert: 'Drowning doesn't just happen'

Adventurous travellers can swim under the waterfall via a natural swimming hole at the bottom of the falls.

BBC: Kauai��s hidden adventures

Visitors can swim under waterfalls or in natural pools, explore miniature caves and dive off a 5m-high wooden platform into the balmy waters below.

BBC: Livin�� la vida Bonito