per unit weight

例句：

1. 1. This machine is designed to weigh a specific amount of material per unit weight.
   这台机器设计用来按每单位重量称量一定量的物料。
2. 2.The company's policy is to charge customers for each unit weight of the product they purchase.
   该公司的政策是按照顾客购买的产品每单位重量收费。
3. 3. The engineer calculated the cost based on the weight of the materials used per unit weight.
   工程师根据使用的材料每单位重量计算了成本。