packing fraction

例句：

1. 1. The packing fraction of thematerial is critical for its performance.
   材料的包装系数对其性能至关重要。
2. 2. The engineer calculated thepacking fraction to determine the optimal filling level.
   工程师计算了包装系数以确定最佳填充水平。
3. 3. The packing fraction affects the overallefficiency of the packaging process.
   包装系数影响整个包装过程的效率。