At the first sign of trouble, schooling fish swim as close together as they can get.

一旦发现危险的迹象，鱼群就会尽可能地游近彼此。

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The first pea wanted to fly in the sky, and the second one's wish was to swim in the sea.

第一颗豌豆想在天空中飞翔，第二颗豌豆的愿望是在海里游泳。

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Baby hippos are born underwater and must swim to the surface to take their first breath.

河马宝宝出生在水里，它必须游到水面进行生命第一次呼吸。

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Matthew Webb became the first person to swim across the English Channel.

CNN: Tuesday,

Last year she switched her sporting nationality, giving up competing for Kenya to swim for the better-resourced Team GB, and in doing so she became the first black woman to swim for the British team.

BBC: Sacrifices of teenage Olympic hopeful Ajulu-Bushell

The first person to swim across Lake Ontario was 16-year-old Marilyn Bell in 1954, according to Swim Ontario, the sport's provincial governing body.

CNN: 14-year-old swims solo across Lake Ontario