bluebirds FREQ #43163 n. 北美洲产的蓝知更鸟( bluebird的复数形式 ) 释义与例句 n. 1. plural of bluebird 相关短语 bluebirds of happiness bluebird of happiness fairy bluebirds mountain bluebirds eastern bluebirds mountain bluebird fairy bluebird 和平鸟 eastern bluebird