I don't know everything about him.
我并不知道他的每一件事。
She wanted to know everything about him.
她想知道他的一切。
If you want to understand someone, you don't need to know everything about him or her.
如果你想要了解一个人,你不需要知道关于他或她的一切。
To know that is to know virtually everything you need to know about him.
了解这点,也就等同完全了解他了。
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