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Progress in agriculture must be measured not just in yield, but in long-term environmental impact.
有时最深刻的数学来自于玩弄简单的想法,直到它们展现出隐藏的复杂性。
Decision making is the heart of administration, and the heart of decision making is art rather than science.
A legal system is a system of rules which are valid according to the system's own criteria of validity.