Undisturbed earths gravity field under the status of hydrostatic equilibrium is parallel gravity field, and its distribution of mass density is spherically Symmetric.
无扰动的流体静力平衡状态下的地球重力场是平行重力场。
The net effect on the piston of all these small irregular forces must be equal to that of the force of gravity if there is to be equilibrium.
假使两方面保持平衡，那么所有这些小的不规则的力对活塞的有效作用必须与重力相等。
The gravity in the moon from the static point 28000 kilometers place, the moon and the earth in the distance on the gravitational equilibrium.
这个引力的静止点在离月球28000公里的地方，月亮和地球在这一距离上引力平衡。
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