| 1. | The stone rolled down the mountain by gravity .
这块石头由于重力作用而滚下山。 |
| 2. | This water was distributed to and over the fields primarily by gravity flow .
这些水主要靠自流灌溉到田里。 |
| 3. | The beam of light is attracted by gravity and follows a curved path rather than a straight line .
光束受引力吸引，不沿直线而沿弯曲路线传播。 |
| 4. | The stone rolled down the hill by gravity
石头由于重力作用而滚下山去。 |
| 5. | The stone rolled down the hill by gravity
石头在重力作用下向山下滚去。 |
| 6. | Galaxies are held together by gravity to form clusters of galaxies
星系团是由星系因引力结集而成。 |
| 7. | A million stars are held together by gravity to form a giant cluster
百万颗恒星聚在一起组成大星团。 |
| 8. | Racking by gravity , on stainless steel plates 3 or 4 times a year
每年三到四次将自然沉淀的固态物质自槽内取出。 |
| 9. | The purified water then descends by gravity to a basement holding tank
经过净化的水靠重力流到地下室的另一个集水箱里。 |
| 10. | Particle size analysis . particle size analysis by gravity sedimentation . pipette method
粒度分析.用重力沉降法的粒度分析.滴定管法 |
