用来制作袋子或麻布袋的粗糙纤维。
他们用特殊的超细纤维来替代粗糙的砂石颗粒，以强化水泥。
They used special microfibers, rather than coarse bits of gravel and sand, to strengthen the cement.
纺锤节表面粗糙，因为里面的纤维是随机交织在一起的。
The spindle-knots have a rough surface, because the fibrils within them are randomly interweaved.
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