four parallel connecting rods
four parallel connecting rods
四个平行连杆
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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A mechanical mode1 of anti-rotation mechanism with balls was established, and its operation principle is analysed, where the con-figuration of simplified parallel four-connecting rods was employed.
建立了球形防自转机构的模型，分析了其工作原理，将球形防自转机构简化为平行四连杆机构。
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