...[arm of force] 杠杆的受力点和支点之间的距离 [ability falling short of one's wishes;ability not equal to one's ambition;lack the ability to do what one would like to...
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moment arm of force [力] 力臂
maximum arm of force 最大力臂
arm of force coefficient 内力臂长度系数
coefficient of rolling force arm 轧制力臂系数
arm of normal force 法向力臂
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