Stepped is a weak form; swam and swum are strong.

Stepped 是按规则变化的形式，swam 和 swum 是不按规则变化的形式。

One-piece maillot with an attached swim skirt.

一款带有小裙摆的女式泳衣。

It is natural for ducks to swim.

鸭子会游泳是天生的。

Ducks’ webbed feet help them to swim.

鸭子的蹼足有助于游水。

I like to swim in the nude.

我喜欢裸泳。

They swim every day during the holidays.

他们在假期天天游泳。

White clouds swam in the blue sky.

白云在蓝天上飘浮。

A cloud swam slowly across the moon.

浮云慢慢地掠过月亮。

He swam his horse across the river.

他使自己的马游过那条河。

The ability to swim is native to fish.

鱼生来就会游泳。

I can swim a maximum of 1 mile.

我游泳最远游一英里。

By perseverance the lame boy learned to swim.

靠毅力这跛童学会了游泳。

The water rippled as the bird swam along.

当鸟儿游过时，水面泛起了波纹。

He has swum the English Channel three times.

他已三次游过英吉利海峡。

They swam till the tide began to ebb.

他们一直游到开始退潮。

Under his father's guidance, he learned how to swim.

他在父亲的指导下学会了游泳。

A Spanish dancer nudibranch swims in the Pacific Ocean.

Near Lord Howe Island, New South Wales, Australia.

I was tempted to strip off for a swim.

我真想脱光衣服下水游泳。

He can swim as well as the next boy.

他游泳游得象其他男孩一样好。

She has a phobia about water and can’t swim.

她怕水, 所以不会游泳。

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