详细解释:【医】 昏睡性脑炎, 嗜眠性脑炎, 流行性脑炎
英语解释：
名词 encephalitis lethargica:
an encephalitis that was epidemic between 1915 and 1926; symptoms include paralysis of the extrinsic eye muscle and extreme muscular weakness同义词：sleeping sickness, sleepy sickness, epidemic encephalitis, lethargic encephalitis