inside and outside thread
... 塑料王 PCTFE 6.外牙三通 tee with outside thread 7.内外丝 inside and outside thread ...
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inside and outside thread
内外螺纹
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Spiral spread to move is depend on inside, outside the thread constitute of spiral pair to deliver sport and motive.
螺旋传动是依靠内、外螺纹组成的螺旋副来传递运动和动力。
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