1、Coelomate animals have a true body cavity that is completely enclosed within mesoderm.
多腔动物具有一个完全被中胚层所包围的真体腔。
2、Coelomates, such as earthworms and humans, have a body cavity surrounding their internal organs.
多腔动物，如蚯蚓和人类，具有一个环绕其内脏的体腔。