小说是一面镜子，不仅反映作者的灵魂，也反映读者的灵魂。

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.

一个问题的价值与其说在于得出答案，不如说在于它迫使潜在的解决者产生的想法和尝试的想法。

完美数如同完美的人一样，非常罕见。