shape class index

例句：

1. 1. The shape classificationindex is used to determine the quality ofa product.
   形状分类指数用于确定产品的质量。
2. 2.The shape classification index has been improved significantlyin recent years.
   近年来，形状分类指数已经显著提高。
3. 3. The shape classification index is animportant factor in determining the performance of amachine.
   形状分类指数是决定机器性能的一个重要因素。