The more you know, the more you realize how little you know.

I'm interested in the weak materials, the materials that people don't think can be used for permanent structures.

There is a kind of bird that can never be closed, for its feathers are shining bright.

Thinking is behavior. The muscular habits learned in overt speech are responsible for implicit or internal speech (thought).

我们都是陌生人，甚至对自己来说也是。