screw traction
螺旋牵引簧 helical tension spring
螺旋式牵引杆 screw tow bar
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均采用直丝弓矫治器矫治，应用螺旋推簧扩展间隙及上颌前方牵引。
They were all treated with straight wire appliance and helical spring to expand clearance.
youdao
研究一种利用螺旋旋转产生牵引力的微型机器人驱动机构。
A kind of driving mechanism of micro-robot utilizing the traction force produced by the rotation of screws was studied.
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