swordtail 的定义
- any of several small, brightly colored, viviparous, freshwater fishes of the genus Xiphophorus, native to Central America, having the lower part of the caudal fin elongated into a swordlike structure: often kept in aquariums.
🎓大学词汇剑尾剑鱼剑尾鱼剑尾巴