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I happened to know about him.
我正巧知道一些有关他的情况。
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I know about him, but I've never met him.
我听说过他, 可从来没有见过他。
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We know about magnetism by the way magnets act.
我们通过磁铁的作用知道磁性是怎么一回事。
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Do you know anything about astronomy?
你懂天文学吗?
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I'll let you know all about it later on.
以后我全让你知道。
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You know as much about it as I do.
关于这一点, 你知道的和我一样多。