iron-loss per unit weight

例句：

1. 1.The iron loss per unit weight of the new steel is significantly lower than that of the old one.
   新钢种的单位重量铁损显著低于旧钢种。
2. 2.The engineer calculated the iron loss per unit weight of the machine parts to ensure optimal performance.
   工程师计算了机器部件的单位重量铁损，以确保最佳性能。
3. 3. The researcher found that the iron loss per unit weight of the battery was higher than expected.
   研究者发现电池的单位重量铁损高于预期。