1. Purpose:To investigate the cause of acute posterior multifocal placoid pigment epitheliopathy (APMPPE).
目的：探讨急性后极部多发性鳞状色素上皮病变（APMPPE） 的发病原因。
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2. Any of numerous fishes of the class Chondrichthyes, characterized by a cartilaginous skeleton and placoid scales and including the sharks, rays, and skates.
属软骨鱼纲的鱼软骨鱼纲鱼的一种，以软骨骨架和板状鱼鳞为特征，包括鲨、鳐、灰鳐。
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3. Any of numerous fishes of the class Chondrichthyes, characterized by a cartilaginous skeleton and placoid scales and including the sharks, rays, and skates.
