And then there are unknown-known, things that you forgot, you knew or you don't realize that, you know, like you still remember how to drive to the supermarket from your childhood home. You just forgot that you knew that.
然後有未知已知,就是你遺忘了自己知道的事情,或者你沒有意識到自己知道的事情,比如你仍然記得從你童年家開車去超市的路。你只是忘了你知道這個。