I didn't want to know about their sordid affair.我不想知道他们的肮脏事。

Do you know about the meeting this afternoon?你知道今天下午开会的事情吗？

Hire someone with experience, someone who knows about real estate.雇一个有经验、了解房地产业的人。

He knows about cars.他对汽车了解颇多。

She knows a lot about wildlife.关于野生动物她知道得很多。

I don't know much about computers.我不怎么懂电脑。

I know nothing about sport.对于运动我一无所知。