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TOEFL BNC: 7973 COCA: 7702

periodic

periodic /ˌpiriˈɑːdɪk/ adjective
periodic
/ˌpiriˈɑːdɪk/
adjective
Learner's definition of PERIODIC
always used before a noun
: happening regularly over a period of time间歇的;周期性的

— periodically

/ˌpiriˈɑːdɪkli/ adverb

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