我摔了一跤擦伤了膝盖。

I fell and grazed my knee.

《牛津词典》

我跌倒在路上，擦伤了膝盖和双手，但是伤得不重，车子也没撞坏。

The fall onto the road grazed my knees and hands, but too not badly.

youdao

我的膝盖擦伤了。

I bruised my knee.

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我跌倒时擦伤了膝盖。

I fell and scraped my knee.

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我跌倒时擦伤了膝盖。

Scraped my knee on the sidewalk.

youdao

我跌倒时擦伤了膝盖。

Scraped my knee on the sidewalk.

youdao