mechanical mass

例句：

1. 1. The machine's mechanical mass is too heavy for us to move it.
   这台机器的机械质量太重了，我们搬不动。
2. 2.The new car has a lighter mechanical mass, making it more fuel-efficient.
   新款汽车的机械质量更轻，因此更省油。
3. 3. The engineer calculated the mechanical mass of the structure to ensure its stability.
   工程师计算了结构的重量以确保其稳定性。