控制的目的是使系统在存在不确定性和干扰的情况下仍能按期望的方式运行。

可持续性不是一种趋势，而是能源的未来。

The young do not know enough to be prudent, and therefore they attempt the impossible – and achieve it, generation after generation.

The most important thing is to have a disciplined approach.

过去是你记得的、想象中记得的、说服自己记得的或假装记得的一切。