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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Confirmation of supersymmetry would be a shot in the arm for M-theory and help physicists explain how each force at work in the universe arose from one super-force at the dawn of time.

如果能证实超对称性的确存在，那无异于为M理论注入了一针强心剂，物理学家们可以借此来解释宇宙诞生之初，各种作用力是如何从一种超级作用力里诞生的？

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To approve the exercise of power would arm Congress with the authority to force individuals to do whatever it sees fit.

CENTERFORSECURITYPOLICY: Center For Security Policy

They said one was a senior operations chief for the Quds Force, an arm of the Iranian Revolutionary Guard, which answers to Iran's religious leaders.

NPR: U.S. Says Iran Supplying Weapons to Iraq Militias

And American forces in Iraq captured an Iranian they said belonged to the Quds Force, an arm of the Revolutionary Guards that helps to train terrorists abroad.

ECONOMIST: Iran's president visits New York