There is a great difference between knowing and understanding: you can know a lot about something and not really understand it.

There is a great difference between knowing and understanding: you can know a lot about something and not really understand it.

知道和理解之间有很大的区别:你可能知道很多事情，但并不真正理解它。

-- Charles F. Kettering 查尔斯·凯特林