名词
中文翻译：支点线
同义词：
['pivot line', 'lever line']
例句：
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1.The fulcrum line is the point where the force exerted by the weight of the object is balanced by the reaction force.
支点线是物体重量施加的力与反作用力平衡的点。
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2.In engineering, the fulcrum line is used to determine the maximum allowable load on a structure.
在工程中，支点线用于确定结构上允许的最大载荷。
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3.The engineer used the fulcrum line to calculate the stresses in the beam under different loads.
工程师使用支点线来计算梁在不同载荷下的应力。