Teachers are the most important role models in schools, the most instructive examples, and the most vivid examples for students.
The historian must have some kinship with his subject. The dead will not speak unless they are properly addressed.
相位裕度是系统在变得不稳定之前可以容忍的程度的度量。
Quality is not a cost; it is an investment.
We must always be forward-thinking, anticipating the needs of the market and the planet.