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To lead is to serve, not to command.
We are moving from an economy based on the production of goods to one based on the production of knowledge.
书说:她这么做是因为。生活说:她这么做了。书是向你解释事情的地方;生活是事情不被解释的地方。我不奇怪有些人更喜欢书。
The Milky Way’s black hole is our closest laboratory for studying extreme gravity.