Concavo-convex veins are always used in the design of woolen sweater.
凹凸纹通常用于羊毛衫的设计中。
Concavo-convex veins are always used in the design of woolen sweater, for it is undulate, irregular, inimitable texture, and gives takes strong wallop to people.
凸凹花纹以凸凹起伏、错落有致、独特的肌理效应在视觉上给人以较强的冲击力，因而，常被用在针织毛衫设计中。
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