无人机的未来是智能、协同和自主的。

The purpose of abstraction is not to be vague, but to create a new semantic level in which one can be absolutely precise.

人心比山川更险恶，比了解天象更困难。

"The war is not over for those who have to live with its consequences."

每个人都有不为世人所知的秘密悲伤；很多时候，我们称一个人冷漠，而他只是悲伤。