The main causes are the impact wear between the solids.The passageway design of the mine stand pump can meet the exchange law of the solid flow field.是什么意思_The main causes are the impact wear between the solids.The passageway design of the mine stand pump can meet the exchange law of the solid flow field.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句