But at age 21 he developed the first symptoms of amyotrophiclateralsclerosis (ALS), a disorder that would inevitably render him paralyzed and incapable of performing most kinds of work.
Hawking has ALS, or amyotrophiclateralsclerosis, which has confined him to a wheelchair and leaves him unable to speak without the help of a computerized voice synthesizer.
霍金患有肌萎缩性脊髓侧索硬化症，简称ALS，他只能坐在轮椅上，说话必须依赖电脑语音发生器。
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For around a decade, scientists have been trying to regrow nerve cells lost in neurodegenerative diseases such as Parkinson's, Alzheimer's and amyotrophiclateralsclerosis (ALS) from stem cells.