Only since 1962 has the show been held biannually.这个展会自1962年才开始一年举办两届。...

adv.每半年地...

biannually的音标：biannually的英式发音音标为：[bi:ən'jʊəlɪ]biannually的美式发音音标为：[biən'jʊrlɪ]...