Step4 section: Venus atmospheric density is very high and the pressure equivalent to 3000 meters underwater pressure.
第四段：金星大气层密度非常之高，造成的压力相当于3000米海底压强。
Therefore, it is very important to choose an appropriate atmospheric density model for a specific orbit to improve the accuracy of orbit forecast.
在这些模型中并没有一种在任何情况下都是最好的，因此，对于特定轨道选择合适的大气密度模型对提高定轨预报的精度是非常重要的。
Atmospheric drag is the main perturbation force on a low earth orbit satellite and is closely related to the variation of high atmospheric density.
大气阻力是低轨卫星主要的摄动力，与高层大气密度的变化密切相关。
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