短語詞組短語permian n period 二曡紀(jì);二疊紀(jì)later permian period 晚二曡世permian -carboniferous period 石炭系二曡系the later permian period 晚二曡世carboniferous -permian period 石炭二曡紀(jì)carboniferous period permian period 石炭permian to triassic period 二曡三曡紀(jì)lower permian period 下二曡紀(jì) 返回 permian period