| 释义 |
腔肠动物qiāngcháng-dòngwù无脊椎动物的一门,体壁由内外两胚层构成,两层之间为胶质,身体中间有一个空腔,既是消化器官,又是体腔。体形有两种,一为钟形或伞形,如水母,一为圆筒形,如水螅和珊瑚。多生活在海洋中。{coelenterate (Coelenterata); invertebrate, usu. living in the ocean, whose body wall is composed of an endoderm and ectoderm, with gel in between, and having a cavity in the middle of the body that serves as a digestive organ and coelom, resembling either a bell or umbrella in shape, as in a jellyfish, or a circular cylinder, as in hydra and coral} |