这句翻译不知道怎么处理，请大家指教！pitting of valve？ pitting of the valve seats 中的pitting可参考： http:///topic/pitting-corrosion pitting corrosion, or pitting, is a form of extremely localized corrosion that leads to the creation of small holes in the metal. the driving power for pitting corrosion is the lack of oxygen around a small area. this area becomes anodic while the area with excess of oxygen becomes cathodic, leading to very localized galvanic corrosion. the corrosion penetrates the mass of the metal, with limited diffusion of ions, further pronouncing the localized lack of oxygen. the mechanism of pitting corrosion is probably the same as crevice corrosion. 我暂时翻译为“起坑”（pit名词是“坑坑洼洼”的意思） 这里 "roll" or "drop-out" all control valves 有些麻烦，我会跟进，楼主。查看更多
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