periodiden.[化]高碘化物periodn.一段时间；周期；时期；课时；学时；句号；月经periodontal pocket packing牙周袋塞治术period parametermodulation周期参数调制period of reduced ejection减慢射血期periodontal membrane space牙周膜间隙period luminosity relation周期光度关系Periodontitis/drug ther牙周炎／药物疗法Periodontal ligament cells牙周膜细胞period of anti-japan war抗战时期period depreciation charge每期折旧费用periodontal membrane fiber牙周膜纤维