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The essence of mathematics lies in its freedom.
Collaboration is the root system of progress in sustainable forestry.
You are always a valuable, worthwhile human being — not because anybody says so, not because you're successful, not because you make a lot of money — but because you decide to believe it and for no other reason.
你不能只是坐在那里等待生活来找你,你必须去争取它。
我们生产的每一桶石油都必须是尽可能负责任地生产出来的。