microscopic fatigue crack

例句：

1. 1. The micro-cracks in thematerial were caused by the high temperature duringthe manufacturing process.
   材料中的微观裂纹是由制造过程中的高温引起的。
2. 2. The engineeranalyzed the data to identifythe cause of the micro-cracks in the structure.
   工程师分析了数据，以确定结构中微观裂纹的原因。
3. 3.The researchers found that the micro-cracks could be a sign of early agingin the material.
   研究人员发现，微观裂纹可能是材料早期老化的迹象。