| 1. | Newton's law of universal gravitation is valid .
牛顿万有引力定律是正确的。 |
| 2. | Newton's law of universal gravitation has been extremely useful .
牛顿的万有引力定律是极其有用的。 |
| 3. | To understand galaxy formation we would like to think of gravitation .
为了理解星系的形成，我们总要想到万有引力。 |
| 4. | Newton's law of gravitation refers to the force between two particles .
牛顿的万有引力定律指的是两个质点之间的力。 |
| 5. | Under the action of universal gravitational forces the small perturbations will grow .
在万有引力的作用下，小扰动会加强。 |
| 6. | The gravitational interaction is disregarded when interactions between individual protons are considered .
在考虑单个质子间相互作用时，万有引力可以忽略不计。 |
| 7. | A bohr atom is a solar system in miniature, with electrical forces taking the place of gravitational forces .
玻尔的原子模型是太阳系的缩影，不过以电力替代万有引力。 |
| 8. | The trouble with the above calculation is that it ignores the effect of gravitation on the expanding matter .
以上计算中的问题在于，它忽略了作用在膨胀物上的万有引力。 |
| 9. | They were also used, for example, to determine the gravitational attraction exerted by a lamina on particles .
例如：他们也用来确定一个薄片作用在一个质点上的万有引力。 |
