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1. Oxford American Dictionary

   river dolphin

   • IPA[ˈrīvər ˈdälfən]

   • n.
     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.

   • noun: river dolphin, plural noun: river dolphins

2. • 更多解釋

   river dolphin

   • n.
     a solitary dolphin with a long slender beak, a small dorsal fin, and very poor eyesight. It ...

   Oxford Dictionary