I know nothing about him 我对他一无所知
我对他所知极少。
I don't know the writer, but I know about him.
我不认识那个作家,但我知道他。
From what I know about him, all the girls like him.
据我所知,所有的女孩子都喜欢他。
I just happened, while I was a graduate student at Oxford University, to meet somebody who is vegetarian and start talking to him about the way we treat animals which I really didn't know much about.
那时我还在牛津攻读硕士研究生,偶然遇到了一个素食者,我们聊到人类是怎样对待动物的,当时我的确不是很了解。
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