在这本书里，牛顿阐述了万有引力和力学三大定律，接下来的三个世纪，这些理论在物理科学领域占据主导地位。
In this book, Newton described universal gravitation and the three laws of motion, which dominated the scientific view of the physical universe for the next three centuries.
一包黄油有本身的万有引力，但是这与像月球、地球或太阳那么大的物体的引力相比，就显得微不足道了。
A packet of butter has a gravitational pull of its own, but this is very small in relation to the pull of something as large as the moon or the earth or the sun.
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