A primitive, bony freshwater fish(Amia calva)of central and eastern North America, with a long, spineless dorsal fin.是什么意思_A primitive, bony freshwater fish(Amia calva)of central and eastern North America, with a long, spineless dorsal fin.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句