she knows是什么意思

　　The doctor told you to stay in bed, and she knows best.

　　医生叫你卧床休息，她最清楚你该怎么做。

　　She knows that becoming world champion is going to be a long haul.

　　她知道要成为世界冠军需要长时间的艰苦努力。

　　I have a sneaking suspicion that she knows more than she's telling us.

　　我私下怀疑，她还知道一些情况，不想告诉我们。