For systems, the analogue of a face-lift is to add to the control graph an edge that creates a cycle, not just an additional node.

Quality is never an accident; it is always the result of intelligent effort.

【释义】：做很多事却少有成效，不如专心做好一件事情。  

创新不是凭空想象，而是基于对用户需求的深刻理解。

量子傅里叶变换是Shor算法中指数级加速的关键。