scum

  • scum blow off cock - 浮滓吹洩旋塞
  • scum blow off valve - 浮渣吹洩閥
  • scum dish - 浮渣皿
  • scum pan - 浮渣盆
  • scum valve - 浮渣吹洩閥；鍋爐上部排污[吹泄]閥

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