They wear a black or blue-gray overcoat,and they have a white belly,a pair of short legs,and two wings that serve as flippers.是什么意思_They wear a black or blue-gray overcoat,and they have a white belly,a pair of short legs,and two wings that serve as flippers.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句