一句话，先是太胆小，明知错的事却不敢不做；后来也还是太胆小，明知对的事却不敢去做。

In the search for new quantum materials, the role of topology cannot be overstated; it is a key to unlocking the mysteries of the quantum realm.

"The story is told through the light and shadow."

自由始终是并且仅仅是持不同思想者的自由。