This turning force in a butterfly valve is determined by three factors. (1) friction of the disc to seat for sealing (2) Bearing friction (3) Dynamic torque.
蝶阀上的这种旋转作用力取决于三个因素：(1)阀瓣与阀座密封的摩擦力；(2)轴承摩擦力；(3)动力矩。
The effectiveness evaluation of the air force aero-complex reflects the changing of the magnitude degree and the correlation of the three factors.
现代空战效能主要由信息、机动和火力三大要素决定，军用航空综合体的效能评估应反映三要素重要度的变化和相互关系的变化。
Transitions occur only when the three-dimensional factors of prerequisites, requirements and motive force gather in a time space, and can be completed only when the motive force is continuous.
跃迁只有在前提、条件和动力三维因素齐备的时空中才会发生，并在动力的持续推动下才能实现。
Transitions occur only when the three-dimensional factors of prerequisites, requirements and motive force gather in a time space, and can be completed only when the motive force is continuous.
跃迁只有在前提、条件和动力三维因素齐备的时空中才会发生，并在动力的持续推动下才能实现。
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