挑战让生活变得有趣；克服挑战让生活变得有意义。

真正的力量来自内心的平静。

孩子是最苛刻的观众，但也是最值得的。

Topological insulators are a prime example of how theoretical predictions can lead to experimental discoveries that reshape our understanding of the physical world.

解析：意在言外，得意忘言。