短語詞組短語permian n period 二疊紀(jì);二迭紀(jì)later permian period 晚二疊世permian -carboniferous period 石炭系二疊系the later permian period 晚二疊世carboniferous -permian period 石炭二疊紀(jì)carboniferous period permian period 石炭permian to triassic period 二疊三疊紀(jì)lower permian period 下二疊紀(jì) 返回 permian period