荒野是一个美丽而危险的地方。要生存，你必须尊重两者。
The wild is a place of beauty and danger. To survive, you have to respect both.
受过教育的心灵的标志是能够思考一种思想而不必接受它。
The most effective policies are often the simplest ones.
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.