a Eurasian perennial herb(Polygonum bistorta) having cylindrical spikes of usually pink flowers and a rhizome used as an astringent in folk medicine是什么意思_a Eurasian perennial herb(Polygonum bistorta) having cylindrical spikes of usually pink flowers and a rhizome used as an astringent in folk medicine在线翻译_英语_读音_用法_例句