| 1. | The force of gravity pulls things towards the earth 's center .
地心吸力把物体吸向地心。 |
| 2. | Obviously the force of gravity mg is acting vertically downward .
显然重力的Mg作用垂直向下。 |
| 3. | For calculating the force of gravity on a satellite, the radius of the earth is irrelevant .
计算地球作用于卫星的重力时，地球的半径是无关紧要的。 |
| 4. | The force of gravity is not constant everywhere for elliptical form and rugged surface of the earth .
由于地球的椭圆形状及其高低不平的表面，重力不是到处都一样的。 |
| 5. | Gravity instruments are designed to measure variation in the force of gravity from one place to another rather than the absolute force itself .
重力仪的设计是为了测量一处到另一处的重力变化，而不是绝对重力值本身。 |
| 6. | The force of gravity pulls things towards the earth ' s centre
地心吸力把物体吸向地心 |
| 7. | Obviously the force of gravity mg is acting vertically downward
显然重力的mg作用垂直向下。 |
| 8. | The force of gravity is with us all the time , though we may not feel it
地球引力无时无刻不存在，尽管我们可能感觉不到它。 |
| 9. | The planets ' strong force of gravity holds huge amounts of hydrogen and helium gas
行星的巨大引力吸引了大量的氢气和氦气。 |
| 10. | Anything that is dropped falls towards the ground because of the force of gravity
落下的东西因为地心引力的缘故，都会掉到地上。 |
