但由于空气的压缩性大、粘度小、系统非线性等因素的影响，气动系统难以实现精密的伺服控制。
However Pneumatic drives exhibit highly nonlinear characteristics due to the compressibility of air, the nonlinearity of valves etc.
空气悬架系统以空气弹簧为弹性元件，利用气体的可压缩性实现其弹性作用。
The elastic element of air suspension system is air spring. Air spring utilize the compressibility of air to realize its elasticity.
气体不仅密度低，而且具有很大的可压缩性，所以空气钻井的体积流量将随压力和温度变化，而压力和温度又随井深变化。
Air has a low density and great compressibility. The volumetric flow rate of air in air drilling varies with pressure and temperature, which in turn, change with WLL depth.
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