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螺纹
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螺纹 [luo2 wen2]
☊
spiral pattern ☊
Gewinde (S, Tech)
☊
螺纹 [luo2 wen2] ☊ 
spiral pattern ☊ 
Gewinde (S, Tech) ☊ 
螺纹 螺纹 [luo2 wen2] ☊ spiral pattern ☊ Gewinde (S, Tech) ☊