demyelinating disease
noun [ U ] medical specialized uk/diːˈmaɪ.ə.lɪ.neɪt.ɪŋ dɪˌziːz/ us/diːˈmaɪ.ə.lɪˌneɪ.t̬ɪŋ dɪˌziːz/
脱髓鞘病，髓鞘脱失病
a disease that damages myelin (= a white fatty substance that covers some nerves)
Multiple sclerosis is the most common demyelinating disease. 多发性硬化症是最常见的髓鞘脱失病。