The backstroke has the advantage of easy breathing, but the disadvantage of swimmers not being able to see where they are going.

仰泳的上风在于便于呼吸，缺点则是游泳者不能看到前方的情况。

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This germ—which is present in soil and water, not feces—is responsible for "swimmers ear", an itchy or painful inflammation of the ear.

这种细菌——存在于泥土和水中，而非粪便——是造成“游泳耳”的主要原因，症状是耳朵发痒疼痛和红肿。

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Even so, their teaching does not encourage babies to be swimmers at too early an age. They still prefer to wait until the baby is able to understand when to hold their breath.

虽然如此，他们的教育不是鼓励宝宝早龄游泳，他们更喜欢等到宝宝会有意识地自主屏住呼吸后才开始游泳。

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The study, published in the latest Morbidity and Mortality Weekly Report, specifically looked at pools in Atlanta, but the researchers say such contamination is likely a widespread problem in U.S. pools, thanks to swimmers not washing themselves off before taking a dip.

CNN: Yuck! What's in your pool water

She said it was probably intended as a "high-spirited prank" but the naked swimmers did not realise how inappropriate their actions were.

BBC: Skinny dippers at Llandudno charity swim in 'bad taste'

Teens should know their own limits, Harvey says, and not follow stronger swimmers without help.

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