1.know one's own business
精明能干收藏指正
2.know one's way about
精通门路收藏指正
3.But I know one single truth .
可我知道一个人儿。收藏指正
4.pretend to know what one doesn't know
强不知以为知收藏指正
5.to know what one wants
了解某人需要什么东西收藏指正
6.know both one's opponent and oneself
知己知彼收藏指正
7.feel sure; know what one is doing
心里有准儿收藏指正
8.Oh,no.Do you know of another one?
哦，真糟糕，你知道哪里还有吗？收藏指正
9.No onions.
不要洋葱。收藏指正
10.I know; it almost happened on one.
我知道这些情况，因为这样的事情差点在我身上发生。收藏指正
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