| 1. | There is an attraction among these stars .
在这些恒星之间存在着一个引力。 |
| 2. | Tensiometers can be made small enough .
引力计可以做得很小。 |
| 3. | We have to submit to law of gravity .
我们必须服从引力定律。 |
| 4. | We owe to newton the principle of gravitation .
我们全靠牛顿才知道引力的原理。 |
| 5. | Gravity holds a privileged position .
引力占有特殊地位。 |
| 6. | Their action is impeded by interionic attraction .
它们的活动被离子间的引力所制约。 |
| 7. | It 's a property of matter to attract .
物质有引力。 |
| 8. | The lunar gravity is about one-sixth that on earth .
月亮的引力大约为地球的六分之一。 |
| 9. | Properties of space must depend on the gravitational potential .
空间性质一定与引力势有关。 |
| 10. | The moon's grip on objects is not as strong as earth's .
月球对物体的引力，不象地球的强大。 |
