孔洞修补
hole-repairing
Hole
Hole-filling
hole filling
hole repairing
repairing hole
孔洞填补
hole filling
filling up of holes
孔洞特征
porous characteristic
pore characteristic
孔洞缺陷
HPI interface
Pore defect
continuous casting
Cavity defects
hole-defects
hole lacuna