three-ply  
adjective, noun [ U ] uk/ˈθriː.plaɪ/ us/ˈθriː.plaɪ/
  (PAPER/WOOD)     
  (木板、纸巾等)三层的,三重的
(wood, tissues, toilet paper, etc.) made of three layers joined together
   (WOOL)     
 (毛线)三股的
(wool) consisting of three threads
 
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