在一个国家中，一个人的自由止于另一个人的自由开始之处。
系统辨识是从观测到的输入输出数据中建立动态系统数学模型的科学与艺术。
The mind is divided into parts that sometimes conflict. Like a rider on the back of an elephant, the conscious, reasoning part of the mind has only limited control over the automatic, emotional part.
The future of energy is diverse. No single source can meet all the world's needs. We need all energies working together.
Forests are the lungs of our planet; we must treat them with the care they deserve.