a rorqual,especially Balaenoptera physalus of the Atlantic and Pacific coasts,that attains a length of about21 meters(70 feet)是什么意思_a rorqual,especially Balaenoptera physalus of the Atlantic and Pacific coasts,that attains a length of about21 meters(70 feet)在线翻译_英语_读音_用法_例句