bi·month·ly /(ˌ)baɪˈmʌn(t)θli/
  (a.)兩月一次的,隔月的,每月兩次的
  bi·month·ly a.  Occurring, done, or coming, once in two months; as, bimonthly visits; bimonthly publications. -- n.  A bimonthly publication.
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  Bi·month·ly, adv. Once in two months.
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  bimonthly
       adj 1: occurring twice a month; "a semimonthly publication" [syn: semimonthly]
       2: occurring every two months; "bimonthly visits" [syn: bimestrial]
       n : a periodical that is published bimonthly
       adv 1: twice a month; "salaries are paid semimonthly" [syn: semimonthly]
       2: every two months; "the bill was payable bimonthly"