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找到真正幸福的唯一方法就是冒着被彻底剖开的风险。
物理学的美丽在于它能够用简单的原理解释复杂的事物。
衡量森林价值的真正标准不是木材的板英尺数,而是几个世纪的生态平衡。
采矿业必须发展以满足不断变化的世界的需求。
"The world is indeed full of peril, and in it there are many dark places; but still there is much that is fair, and though in all lands love is now mingled with grief, it grows perhaps the greater."