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When you hold a piece of aggregate, you're holding millions of years of earth's history.
经济与生态之间的平衡是现代林业的核心。
The primary rules of obligation are those that require or forbid certain actions.
The best experiments often come from simple ideas and careful observation.
快乐的情感是来源于与不好的事的对比,而快乐本身并没有任何意义。
对某事的恐惧是仇恨他人的根源,内心的仇恨最终会摧毁仇恨者。