peri·od·icAWBrE/ˌpɪəriˈɒdɪk/NAmE/ˌpɪriˈɑːdɪk/ (also less frequentperi·od·icalBrE/ˌpɪəriˈɒdɪkl/NAmE/ˌpɪriˈɑːdɪkl/) adjective[usually before noun]happeningfairlyoftenandregularly间发性的;定期的;周期的◆Periodicchecksarecarriedoutontheequipment. 设备定期进行检查。▸peri·od·ic·al·lyAWBrE/ˌpɪəriˈɒdɪkli/NAmE/ˌpɪriˈɑːdɪkli/adverb◆Mailinglistsareupdatedperiodically. 邮寄名单定期更新。