At last he seemed to have solved the main difficulties. But he did not publish his findings at once.
他似乎终于解决了主要的难题，但他并没有立刻发表他的发现。
Only in 1687 did he at last publish his new theory.
终于在一六八七年他才发表了他的新理论。
Newton's great work, The Mathematical Principles of Natural Philosophy, marked the triumph of the Scientific
 Revolution.
牛顿的伟大作品是「自然科学的数学原理」，表示了科学革命的胜利。
The very title is significant.
书名本身就非常有意义。
Newton had found the mathematical principles, the scientific laws which governed the movements of earth and heavens.
牛顿发现了数学原理，那是支配地球和天上星球运动的科学法则。
The book completed the working out of a new view of nature, a task begun by Copernicus.
这本书完成了对自然界新看法的研究，这是从哥白尼开始的一项工作。
The result was an exact mathematical world.
结果正是数学的世界。
Newton put forward three laws of motion in the book.
在书中，牛顿提出三个运动定律。
The first law stated that bodies will tend to move in a straight line with uniform motion unless acted upon by a
 force.
第一个定律说，物体倾向于以同样的动作沿直线运动，除非受外力的作用。
Thus, a bullet shot from a gun moves straight ahead until it is stopped by a target or it slows and falls as a result
  of the friction caused by moving through air.
因此从枪膛射出的子弹往前直进，直到它被靶挡住或因经过空气而受摩擦，它才减低速度或落下。
The second law stated that the force applied to a body is in proportion to the acceleration of the body.
第二个定律说，加于某一物体的力量与该物体的加速度成正比。
Thus, the harder you throw a ball the faster it will move.
因此，你球掷得愈猛，它移动得愈快。
The third law said that every action has an equal and opposite reaction.
第三个定律说每一个作用力都有相等的反作用力。
Thus, when you hit a punching bag, it bounces right back at you.
因此，当你击吊袋时，它就朝着你弹回来。
Newton also worked out a mathematical expression for gravity.
牛顿也为地心引力完成了一种数学公式。
It applied equally to the apple falling from the tree and the moon going around the earth.
它同样可应用于苹果从树上落下和月球绕地球转动。
Newton was soon recognized as the leader of English science.
牛顿很快被公认为英国科学界的领袖。

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