a fish of the family Polyodontidae,having a long paddle-shaped snout,especially Polyodon spathula of the Mississippi River basin是什么意思_a fish of the family Polyodontidae,having a long paddle-shaped snout,especially Polyodon spathula of the Mississippi River basin在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句