yarn that has an elastic core wound around with cotton or silk or nylon or rayon threads
lastex详细解释
Las.tex NONE（无词性）A trademark used for a yarn having a core of elastic rubber wound with rayon, nylon, silk, or cotton threads.橡皮线：一种商标名，用于内有弹性橡皮线、外由人造纤维、尼龙、丝或棉线包裹的松紧线
