Then Newton used his calculus to show how an apple is pulled to the earth and how the earth pulls the moon into an orbit, and how these pulls are the same as the sun’s on the planets.
牛顿用他的微积分，演算出了苹果如何掉地上的；地球如何拽住月亮，让月亮绕着轨道跑；太阳如何用这种方式拽着各个行星。
If the Earth was an apple, Gallo said, the water layer would be thinner than the fruit's skin.
盖洛说，如果地球是一只苹果，水层比苹果皮还要薄。
Well, the earth is going to fall towards the apple — So the force on the earth is the mass of the earth times the acceleration of the earth.
地球也会坠向苹果-，因此地球上的力与地球的质量相等，再乘以地球的加速度。
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