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.
对于系统，翻版的模拟是在控制图中添加一个创建循环的边，而不仅仅是一个附加节点。
Technology is just a tool. It's the creativity and imagination of the people using it that makes the difference.
Don't be embarrassed by your failures, learn from them and start again.
一瞬间，过去的一切都离你而去，剩下的只有回忆。