无偿工作的价值在经济衡量中常常不可见，但它却是社会的支柱。
The value of unpaid work is often invisible in economic measures, yet it is the backbone of society.
系统不是一个生产系统，而是一个消费系统。
"To write is to remember, and to remember is to live again."
We must invest in our people as much as we invest in our technology.
Teachers are the most important role models in schools, the most instructive examples, and the most vivid examples for students.