In the light of the problems with the existent chain drive pumping hots,a new weight-balanced chain drive pumping unit without the reverse rack is designed.是什么意思_In the light of the problems with the existent chain drive pumping hots,a new weight-balanced chain drive pumping unit without the reverse rack is designed.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句