This developed new type of sealing washer worked upright column for hydraulic supprt and jack has good tightness and long lifespan and it is promising.是什么意思_This developed new type of sealing washer worked upright column for hydraulic supprt and jack has good tightness and long lifespan and it is promising.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句