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。
Is it viscosity of land or gravitational field of culture?
是土地的粘性，还是文化的引力场？
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。
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；
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。
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。
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