river dolphin
noun
1- a solitary dolphin with a long slender beak, a small dorsal fin, and very poor eyesight. It lives in rivers and coastal waters of South America, India, and China, using echolocation to find its prey.河豚, 喙豚。
1.1
- Family Platanistidae: four genera and species.喙豚科：4属, 4种。