“灰质”用英语怎么说

脊髓灰质软化病主要侵害肥育猪群.Poliomyelomalacia affected primarily fattening stock.每个珊瑚虫有灰质的骨骼.Each animal has a chalky skeleton.自然堆积的灰质鲕粒砂具有40%的孔隙度,因为其颗粒其本上都是球状的.Oolite lime sand packs naturally with 40 % porosity because the particl...

“灰质”的拼音为：huī zhì...