helical tension spring
... helical structure condenser 螺旋形结构冷凝器 helical tension spring 螺旋牵引簧 helical tube 螺旋管 ...
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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.
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