这句翻译不知道怎么处理,请大家指教!pitting of valve? 仅供参考,我的理解是: where practical "roll" or "drop-out" all control valves to prevent pitting of the valve seats due to deposition of debris on the seat. 如果适用,应“摇动”或“晃动”所有的调节阀,以防止因锈皮沉积在阀座上而导致其被点蚀。 drop out 使脱落、掉落 roll 摇动、转动、摇摆查看更多