unit residual elongation

例句：

1. 1.The engineer used a unit residual elongation test to measure the material's strength.
   工程师使用单位残余伸长率测试来测量材料的强度。
2. 2. This method is widely used in the testing of materials with high unit residual elongation.
   这种方法广泛应用于具有高单位残余伸长率的材料测试中。
3. 3.The researcher found that the unit residual elongation of the material was significantly reduced after the processing.
   研究者发现，经过处理后材料的单位残余伸长率显著降低。