引力

• Phenomena in the universe are ruled by two long-range forces, gravity and electromagnetism .
  宇宙界的各种现象由两种长程力，即引力和电磁力所支配。
• For each double cone, the opposite pulls from two parts of the sphere exactly cancel .
  就每一双锥面来说，球壳的两个部分所产生的相反引力正好对消。
• Even though the moon's gravity is not so strong as the earth's, it does something to the earth .
  尽管月球引力不如地球引力那么大，但对地球仍有影响。
• This water gets the weakest pull of the moon's gravity, so it is left heaped up in a bulge too .
  这里的海水受到的月球引力最小，所以也聚在一起形成涨潮。
• The attractive force increases as a gas is compressed and its molecules are brought closer together .
  随着气体被压缩，气体分子之间的距离缩小，引力增大。
• Newton's problem was to express in mathematical terms the gravitational force between different bodies .
  牛顿的目标是要用数学形式来表示不同物体之间的引力。
• Gravity, the force of the earth's attraction, governs the atmosphere just as it governs solid objects .
  引力，即地球的吸引力，正象它影响着固体那样影响着大气。
• The moon was formed elsewhere in the solar system and was later captured by the earth's gravitational field .
  月球在太阳系别的地方形成，然后被地球的引力场俘获。
• Only the rocket will enable him to overcome the gravity of the earth and to reach the vast emptiness of space .
  只有火箭才能使它克服地球引力，到达广漠无垠的空间。
• From this point of view the effect of gravity is regarded as a local distortion in the geometry of space .
  从这个观点来说，引力的效应可以看成是空间几何中的局部形变。