真相往往隐藏在显而易见之处。

The worst thing in the world that can happen to you if you're an engineer that has given your life to something is for someone to rip it off and put their name on it.

每种材料都有自己的记忆和历史。

从生活中学习，从书籍中学习，从他人中学习。

The best time to buy is when no one else wants it.