subsurface defect

• 内部缺陷,亚表面缺陷

subsurface defect的用法和样例：

例句

1. However, a low fatigue strength detail or a large built-in defect may produce only a single significant crack.
   但是，疲劳强度较低的细节部分或较大的内部缺陷可能只产生一条很大的裂纹。