旅行就是用双脚写作。
To travel is to write with your feet.
Sometimes the thing you're most afraid of is the thing that will set you free.
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.
人是自己的世界。
邪恶是无法解释的东西。它就是这样存在。