The air flows down to a shaft and thus loses potential energy.
空气向下进入竖井，因而失去势能。
Mine, the causes of natural thermal potential difference in return air in main shaft and its influence on mine ventilation system and the control methods.
阐述了造成主井回风的自然热位差产生原因和对通风系统的影响，以及治理办法。
When potential energy of the energy storage spring is higher than the resistance, it makes output shaft stably accelerate.
当蓄能簧势能大于阻力后，使输出轴平稳加速。
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