/ˌpɪəriˈɒdɪk ||; ˌpɪrɪˈɑdɪk/(also
periodical /-kl
||; -kḷ/)
adj happening fairly regularly 定期的；定期发生的:
We have periodic meetings to check on progress. 我们定期开会检查进展情况。 ➔periodically /-kli ||; -klɪ/ adv All machines need to be checked periodically. 所有机器都需要定期检查。