myasthenia gravis
noun [ U ] medical specialized uk/maɪ.əsˌθiː.ni.ə ˈɡrɑː.vɪs/ us/ˌmaɪ.əsˈθiː.ni.ə ˈɡræv.ɪs/
重症肌无力
a chronic disease causing weakness of the muscles of the face, arms, and legs that leads to the eyelids falling down and an unsteady way of walking