packing density

例句：

1. 1.The packing density of the product is very high, which makes it difficult to store.
   产品的包装密度非常高，这使得存储变得困难。
2. 2.The engineer calculated the packing density of the materials used in the production process.
   工程师计算了生产过程中使用的材料的包装密度。
3. 3. The packing density of the material affects its strength and durability.
   材料的包装密度会影响其强度和耐用性。