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.
I'm not perfect, and I don't pretend to be.
图画书就像是可以捧在手心里的小艺术品。
In this business, if you're good, you're right six times out of ten. You're never going to be right nine times out of ten.