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

她是我家的医生，为我女儿在药橱里找胃药或在我儿子擦伤的膝盖上敷药。

She's been our doctor, reaching into a medicine cabinet for the remedy to calm a young girl's stomach or soothe a boy's scraped knee.

youdao