Expeller seals combined with packing include expeller, pressure-relief cover, sleeve, packing water sealing ring and packing gland, etc.是什么意思_Expeller seals combined with packing include expeller, pressure-relief cover, sleeve, packing water sealing ring and packing gland, etc.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句