periodiden.[化]高碘化物periodn.一段时间；周期；时期；课时；学时；句号；月经Period of Cold Wave Outbreak寒潮期间period Daoguang and Xianfeng道咸间period-energy relationship周期-能量关系period of political tutelage训政时期period of qualifying service合格服务期间period Perinatal health care围产期保健period doubling bifurcations倍周期分岔period termination detection周期终止探测periodontal principle fibers牙周膜主纤维period-doubhng bifurcation倍周期分岔