The effect of tension on arm of force was studied that: forward tension can enhance the arm of force.

连轧过程张力是最主要的因素，研究了张力对力臂的影响规律：前张力使力臂增加。

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In medieval times, a lance couched under the rider's arm, unifying the force of rider and weapon, would throw its wielder backwards off the horse at impact.

在中世纪，一把长矛被放在骑手的臂膀下，以统一骑手和武器的力量，一旦受到冲击，持兵器者就会向后摔下马去。

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