gravimetry data

例句：

1. 1. The gravitational pullof the earth is what keeps us onthe surface of the earth.
   地球的引力作用使我们保持在地球表面。
2. 2. Gravitational waves havebeen detected in recent experiments.
   最近实验中已经探测到引力波。
3. 3.The gravitational force between twoobjects is directly proportional to their masses.
   两个物体之间的引力力与它们的质量成正比。