back-fat thickness

例句：

1. 1. The back-fat thickness of the cow is an important factor in determining its quality.
   奶牛的背膘厚度是决定其品质的重要因素。
2. 2. The back-fat thickness of the meat is a critical indicator of its freshness.
   肉的背膘厚度是判断其新鲜度的关键指标。
3. 3. The back-fat thickness of the fish is an important consideration when selecting seafood.
   选择海鲜时，鱼的背膘厚度是一个重要因素。