periodic key周期索引
periodicadj.周期的;定期的;间歇的;完句的
Periodic Depot Maintenance定期后方保养
periodic fecal examination定期检便
Periodic taple of elements元素周期表
periodic chemical reaction间歇化学反应
periodic shedding of nails周期性甲脱落
periodic layered structure层片状组织
periodic micro-structure周期性微结构
periodic positive solution周期正解