打磨区也用着色渗透剂进行了检查，以便确保无裂纹尖端留存。

The ground area was also checked with dye-penetrant to ensure that no crack tip remained.

youdao

打磨区也用着色渗透剂进行了检查，以便确保无裂纹尖端留存。

The ground area was also checked with dye-penetrant to ensure that no crack tip remained.

youdao