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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 only thing that matters is what you do, not what you think or say or feel.
The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge.
Every tree planted today is a legacy for tomorrow.
The stock market is filled with individuals who know the price of everything, but the value of nothing.