periodicaln.期刊adj.定期的
periodical furnace分批作业炉,周期式作业炉
periodical lending期刊外借
periodical catalog期刊目录
periodically poled周期性畴极化反转
periodical changes周期变化
periodical logging定时记录
periodical disease[医] 周期性疾病
periodical renewal周期性更新
periodicals dealer过刊商
periodical feeding循环供水