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