There are other reasons --There are other reasons why it's perhaps harder now to feel calm than ever before. One of these, and it's paradoxical, because it's linked to something that's rather nice, is the hope we all have for our careers. Never before have expectations been so high about what human beings can achieve with their life span.

改变是不可避免的，但成长是可选的。

好奇心是所有伟大数学发现背后的驱动力。

The ability to observe and control electron motion in real-time opens up new frontiers in understanding the fundamental processes of nature.

中心地的规模和分布并非偶然，而是遵循一定的规律。