In birds it consists of the trachea, the syrinx, the oral cavity, the upper part of the esophagus, and the beak.是什么意思_In birds it consists of the trachea, the syrinx, the oral cavity, the upper part of the esophagus, and the beak.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句