善意并不是自己内心发出的，不能保留；行为自身不能够理解和辨别的，不能去做。

The paper industry has a responsibility to lead the way in sustainable practices—we can't wait for others to show us how.

真正的智能是润物细无声的服务，而非炫技。

Time is a concept that humans have created to make sense of the universe, but the universe itself is timeless.

追求数学真理就是追求美、优雅和简洁。