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刃形支承
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〔knife-edge〕
A wedge of metal used as a low-friction fulcrum for a balancing beam or lever.
刃形支承
:一种楔形金属,用作平衡木或杠杆的摩擦小的支撑物
美国传统
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更新时间:2025/5/3 7:43:06