Uneven twill fabrics have a right and a wrong side and therefore are not considered reversible.
单面斜纹织物具有正反面，两面是不能互换的。
Denim is cotton dyed indigo blue color of the warp and weft, using three-down twill weave woven right in general can be divided into light, medium and heavy categories.
牛仔布是以纯棉靛兰染色的经纱与本色的纬纱，采用三上一下的右斜纹组织交织而成，一般可分为轻型、中型和重型三类。
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