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最常见的东西往往最易被忽视,即便它对维持正常世界不可或缺,也不免如此。引力就是最佳例证。若非300多年前有只苹果掉下来砸在一个伟大的脑袋上,人类认识引力恐怕还要多费些时日。
The most common thing is often the most overlooked, even if it is indispensable for maintaining the normal world. Gravitation is the best example. If there were only one apple falling down on a great head more than 300 years ago, it would take more time for humans to understand gravitation.