These books reflect a trend particularly strong in Britain, where swimming in pools is declining, but more and more folks are opting for open water.

这些书反映了一种在英国特别强烈的趋势：在游泳池里游泳的人越来越少，越来越多的人选择去开放水域。

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Because they are always swimming, tunas simply have to open their mouths, and water is forced in and over their gills.

因为它们总是在游泳，所以金枪鱼只需要张开嘴巴，水就会被强行灌进它们的鳃里。

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These books reflect a trend, particularly strong in Britain, where swimming in pools is declining, but more and more folks are opting for open water.

这些书反映了一种趋势，在英国尤为突出：在游泳池里游泳的人越来越少，越来越多的人选择去开放水域游泳。

youdao

She is a fixture of the open-water swimming scene of New York City and currently holds the title of fastest woman to swim around Manhattan at 5 hours, 44 minutes.

WSJ: N.Y.'s Tour de Hudson

The first relay runner to take the flame was Greece's Liverpool-born open water swimming champion Spyros Gianniotis.

CNN: 2012 Olympic flame lit in ancient stadium

Gold in the men's open water 10-kilometer swimming marathon in the Serpentine, the lake in London's Hyde Park, went to Tunisian Oussama Mellouli.

CNN: August 10, 2012 -- Updated 2336 GMT (0736 HKT)