defect of surface quality

• 表面质量缺陷

defect of surface quality的用法和样例：

例句

1. Bread and cake in the course of becoming stale lose some water and this is a quality defect.
   但面包和蛋糕在老化过程中损失水分则造成质量缺陷。
2. When mud in bricking-ups dries and solidifies, quality defects shall not be amended by knocking but being rebuilt.
   砌体中泥浆干固时，不得用敲打的办法修正其质量缺陷，而应拆除重砌。