名詞 external ear:

1. the part of the ear visible externally
   同義詞：outer ear

1. Any of various structures, such as the external ear, that resemble a shell in shape.
   貝殼狀結構任一種類似于貝殼的形狀結構，例如人的外耳
2. The absence or closure of a normal body orifice or tubular passage such as the anus, intestine, or external ear canal.
   (先天性)閉鎖，無孔正常的身體孔或管道，如肛門、腸或外耳道的缺失或閉合