three-ply
(a.)三重的,三股的三重,三股,三層夾板
Three-ply a. Consisting of three distinct webs inwrought together in weaving, as cloth or carpeting; having three strands; threefold.
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three-ply
adj : having a thickness made up of three layers or strands;
"three-ply cloth"; "three-ply yarn"