Any of several tiny North American birds of the genus Polioptila, having bluish-gray and white plumage, a long tail, and a small, slender bill.是什么意思_Any of several tiny North American birds of the genus Polioptila, having bluish-gray and white plumage, a long tail, and a small, slender bill.在线翻译_英语_读音_用法_例句