下垂一個(gè)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瞼的下垂
Abnormal lowering or drooping of an organ or a part, especially a drooping of the upper eyelid caused by muscle weakness or paralysis.
眼淚由上眼瞼下面的器官分泌。
Tears are secreted by an organ under the upper eyelid.
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