index yarn

例句：

1. 1.The index yarn is used to measure the density of the fabric.
   索引纱线用于测量织物的密度。
2. 2. The weavers use different types of index yarn to create their unique patterns.
   织工们使用不同类型的索引纱线来创造他们独特的图案。
3. 3. The index yarn is essential for creating a smooth and even texture in the fabric.
   索引纱线对于在织物中创造出平滑和均匀的纹理至关重要。