不去尝试办不到的事情, 不去追求得不到的东西, 不居于不能持久的地位, 不推行不可重复的政策。

The discovery of topological insulators has opened up a new frontier in condensed matter physics, where the interplay of symmetry and topology leads to novel quantum states of matter.

你画的每一条线都有后果——空间的、结构的、社会的。