The quality of the whole set and various parts of domestic mining scraper conveyors is analysed to promote the manafacture of scraper conveyors.是什么意思_The quality of the whole set and various parts of domestic mining scraper conveyors is analysed to promote the manafacture of scraper conveyors.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句