How do you know him, on the radio or on TV?

你是怎么认识他的，是通过电台还是通过电视？

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"I see you know how to swim very well," she said, watching him do the backstroke.

“看来你很会游泳啊”，她一边说一边看他仰泳。

《柯林斯英汉双解大词典》

His friend asked him, "You are not a fish. How do you know they are happy?"

他的朋友问他：“你不是鱼。怎么知道鱼的快乐？”

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