If I don't know I don't know, I think I know. If I don't know I know, I think I don't know.

If I don't know I don't know, I think I know. If I don't know I know, I think I don't know.

如果我不知道我不知道，我想我知道。如果我不知道我知道，我想我不知道。

-- R. D. Laing R.D.莱恩