etch pits的用法和樣例：
例句
- The corrosion pits on the blade surface contributed to such failure as an additive factor.
葉片表面的腐蝕坑是其疲勞斷裂的另一促進因素。 - The damage of sub-surface was very similar to the damage of the surface, mainly with a few oxidation eroding pits.
次表層上主要分佈著少量細小的氧化腐蝕坑，次表層和表層的失效非常吻合。
