1. The cavity within the body of all animals higher than the coelenterates and certain primitive worms, formed by the splitting of the embryonic mesoderm into two layers. In mammals it forms the peritoneal, pleural, and pericardial cavities. 
   体腔高于腔肠动物和一些本源虫的所有动物体内的腔，由中胚层裂成两层形成。它形成哺乳动物的腹膜的、胸膜的和心包的腔

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