internal characteristic curve

例句：

1. 1. The internalcharacteristic curve of the material is crucial forits performance.
   该材料的内特性曲线对其性能至关重要。
2. 2. The engineer used a computer programto calculate the internal characteristic curve of themachine.
   工程师使用计算机程序计算了机器的内特性曲线。
3. 3. The researcher foundthat the internal characteristic curve of the materialhad a significant impact on its strength.
   研究人员发现，材料的内部特性曲线对其强度有显著影响。