Amyotrophic lateral sclerosis(ALS)is a fatal neurodegenerative disorder characterized by progressive loss of motoneurons.是什么意思_Amyotrophic lateral sclerosis(ALS)is a fatal neurodegenerative disorder characterized by progressive loss of motoneurons.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句