如果时空穿梭是可能的，那从未来穿越回来的旅客在哪里呢？

花尽可能多的时间精心设计电子邮件的标题，因为这往往是人们唯一会看的内容。

The key to progress in science is persistence and an open mind.

The AdS/CFT correspondence is a powerful tool that bridges the gap between quantum field theory and gravity, offering insights into the nature of spacetime itself.