In year 2001-2003, Ningxia Geology Survey Institute has carried out regional geology investigation work of 1:250,000 Guyuan region in southern Ningxia.是什么意思_In year 2001-2003, Ningxia Geology Survey Institute has carried out regional geology investigation work of 1:250,000 Guyuan region in southern Ningxia.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句