upper eyelid

详细解释:【医】 上睑

例句：

Abnormal lowering or drooping of an organ or a part, especially a drooping of the upper eyelid caused by muscle weakness or paralysis.下垂一个器官或器官的一部分不正常的下降或垂落，尤其指由肌肉松弛或麻痹引起的上眼睑的下垂