Resource Depletion Mining Cities of Our Country Arein Urgent Need of Economic Conversion--Taking Baiyin City of Gansu Province for Example是什么意思_Resource Depletion Mining Cities of Our Country Arein Urgent Need of Economic Conversion--Taking Baiyin City of Gansu Province for Example在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句