压力是一种特权,它意味着你有机会做一些伟大的事情。
"The desert teaches patience, silence, and the value of small things."
成长是痛苦的,但没有什么比停滞不前更痛苦。
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.