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Modern quarrying requires us to be geologists, ecologists, and community diplomats simultaneously.

The best mathematics is simple, but not too simple.

The test of our progress is not whether we add more to the abundance of those who have much; it is whether we provide enough for those who have too little.

All men are created equal.

在網球中，就像在生活中一樣，你必須不斷前進——一次一分。