It utilizes the multi-cylinder synchronization technology to expand and retrieve the internal mold with pressure retaining technology to keep the internal mold expanded during casting of box girders.是什么意思_It utilizes the multi-cylinder synchronization technology to expand and retrieve the internal mold with pressure retaining technology to keep the internal mold expanded during casting of box girders.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句