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Leadership means making tough decisions even when they are unpopular.
Natural gas is a versatile fuel that can support renewable energy growth by providing reliability when the sun isn't shining and the wind isn't blowing.
The psychologist must study the mind as it is, not as it ought to be.
每一项科学发现都应该以其对人类福祉的贡献来衡量。
The best time to plant a tree was 20 years ago. The second best time is now.