考虑海水的可压缩性时，有效位能包括有效重力位能与有效内能两部分。
If the compressibility of seawater is considered, the APE should be divided into two parts: The Available Gravitational Potential Energy (AGPE) and The Available Internal Energy (AIE).
通过向下吹风，这些风扇可以抵消引力，有效地减轻探测车的重力。
By blowing downward these fans oppose the force of gravity, effectively lightening the vehicle.
研究结果表明，气顶油藏顶部注氮气重力驱可以有效地提高采收率，达到降水增油的效果；
The results show that oil recovery can be enhanced effectively by gravity drive of crestal nitrogen injection for increasing oil production and decreasing water cut.
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