艾萨克·牛顿爵士和苹果（2）
“er hold it to its branch,” ht.
but sir isaac round? s fall to the ground—but ood reason. for then heavy? heavier than another?”
un to think about this he did not stop until he had reasoned it all out.
millions and millions of people had seen apples fall, but it s fall, as ive a name to the force that causes this.
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