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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We don't go swimming from October to March because there may be box jellyfish in the water.

我们从10月到3月不去游泳，因为水里可能有箱形水母。

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Swimming also presents less risk of muscle and joint injury because of the body's weightlessness in water.

VOA: special.2010.06.08

Because a swimming pool has a lot of chemicals in it.

因为游泳池里添加了很多化学成分。

I like实战 - SpeakingMax英语口语达人

"No one may be denied the right to use a swimming pool because of their race or the color of their skin, " said Thomas E.

CNN: STORY HIGHLIGHTS

South San Francisco resident Vindy Chiu signed up her 6-year-old dog, Turbo, for swimming classes because she feared the white Eskipoo had inherited her apprehensions about water.

WSJ: See Spot Swim: Remedial Lessons Put Pooches in the Pool

However, the eyes of a winghead shark (Eusphyra blochii), which Dr McComb describes as a 'swimming boomerang' because its head width is almost half its body length, overlap by 48 degrees.

BBC: Earth News - Hammerhead shark mystery solved