写作的行为是一种乐观的行为。如果你觉得它不重要，你就不会费心去做。
The act of writing is an act of optimism. You would not take the trouble to do it if you felt it didn't matter.
The great powers are always searching for opportunities to gain power at the expense of rivals, and to dominate the system.
数学的美在于它能够以最优雅的方式描述宇宙。
The concept of computational efficiency is central to the design of learning algorithms.