pe·ri·od·i·cal·ly /ˌpɪriˈɑdɪk(ə)li/ 週期地
Pe·ri·od·ic·al·ly, adv. In a periodical4 manner; as, flooding occurs periodically in the valley. ◄ ►
periodically adv : in a sporadic manner; "he only works sporadically" [syn: sporadically]