单词：etch pits
etch pits的用法和样例：
例句
- The corrosion pits on the blade surface contributed to such failure as an additive factor.叶片表面的腐蚀坑是其疲劳断裂的另一促进因素。
- The damage of sub-surface was very similar to the damage of the surface, mainly with a few oxidation eroding pits.次表层上主要分布着少量细小的氧化腐蚀坑，次表层和表层的失效非常吻合。
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