luó xuán xiàn
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Chinese dictionary
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  • n.helix; helical line; spiral line

    • chǐ lún luó xuán xiàn yàng bǎn shì yī zhǒng biāo zhǔn jì liàng qì jù

      齿轮螺旋线样板标准计量器具

      Gear helix master is the standard measuring apparatus.