Prana a is energy. It is the self-energizing force, embraces the body will extension, expansion and control.
是生命之气，是一种自我激励的能量，拥有这股能量，身体将会得到延展，扩张和控制。 。
3
The Self-energizing of a tractor's disc braking system is studied. A concept of self-energizing efficiency is proposed for the first time in this paper.