心理上的齿轮不是弹指间就可逆转的。
Psychological gears cannot be reversed at a snap of the fingers.
此设备预塑油压马达上装有止逆转键，它可卡入预塑马达中齿轮的任意两齿之间。
A stop reverse key arranged on the preplasticizing oil pressure motor of the device can be clamped between two random teeth of a gear in the preplasticizing oil pressure motor.
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