He was afraid the dog's hairs might dirty the seats.

他担心狗毛会把座椅弄脏。

《柯林斯英汉双解大词典》

One reason was that they were afraid of catching a disease from a dirty hypodermic needle.

一个原因是他们害怕因为用了脏的注射器针头而得病。

youdao

You know how to make a commitment and you're not afraid to get your hands dirty to achieve team objectives.

你知道该如何去履行承诺，你并不惧怕为了实现团队的目标而弄脏自己的双手。

youdao

She wasn't afraid to get her hands dirty.

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And it means being the humble, emotionally intelligent leader who is not afraid to get her or his hands dirty in the trenches.

FORBES: The Debate Continues: Do You Prefer Superstar Individuals or Effective Teams?