形容词海牛类
1. Sirenian tusked mammal found from eastern Africa to Australia; the flat tail is bilobate.
见于非洲东部到澳大利亚的有尖牙的海牛目哺乳动物；扁平的尾巴分两叉。
noun
1. any of two families of large herbivorous aquatic mammals with paddle-shaped tails and flipper-like forelimbs and no hind limbs
Synonym: sea cow sirenian mammal