Multiple sclerosis(MS)which has unknown aetiology and etiopathogenesis,is a chronic,autoimmune disease of the central nervous system(CNS).是什么意思_Multiple sclerosis(MS)which has unknown aetiology and etiopathogenesis,is a chronic,autoimmune disease of the central nervous system(CNS).在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句