cream line index

例句：

1. 1. The cream line index is acrucial indicator for the dairy industry.
   奶油线指数是乳业行业的关键指标。
2. 2. The creamline index has been declining dueto the rising cost of milk production.
   由于牛奶生产成本的上升，奶油线指数一直在下降。
3. 3. The cream line index is used tomeasure the quality of butter and other dairyproducts.
   奶油线指数用于衡量黄油和其他乳制品的质量。