the GRAIL mission, twin spacecraft due to measure the Moon's gravitational field;
还有“圣杯”的使命，孪生的飞船将会测量月球的重力场；
A gravitational field or an electric field, you can't.
在重力场或者电场里面，就做不到了。
This is usually an object that moves in response to a gravitational field.
通常是一种受重力作用移动的物体。
This problem demonstrates why the energy density of gravitational field is negative.
本题演示为何重力场的能量密度是负的。
Is it viscosity of land or gravitational field of culture?
是土地的粘性，还是文化的引力场？
Is it viscosity of land or gravitational field of culture?
是土地的粘性，还是文化的引力场？
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