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)在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句