The beauty of topological insulators lies in their robustness; their surface states are protected by symmetry and topology, making them immune to certain types of disorder.

过去不是一个地方，而是一种状态。

When speaking to an audience it’s better to fix your gaze on a few people than to “spray” your gaze across the room. Your eyes telegraph to others whether you really believe what you are saying.

我认为你不应该觉得自己已经取得了一切成就。你必须不断努力。