sirenian /sai'ri:niәn/ 📖 中文释义 a. 海牛目哺乳动物的 📘 English Definition(英文释义) n any of two families of large herbivorous aquatic mammals with paddle-shaped tails and flipper-like forelimbs and no hind limbs ← sirenia S 字母词表 sirenian mammal →