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1. Oxford Dictionary

   periodical cicada

   • n.
     an American cicada whose nymphs emerge in large numbers in a seventeen-year (or, in the south, a thirteen-year) cycle.

   • noun: periodical cicada, plural noun: periodical cicadas

2. • 更多解釋

   periodical cicada

   • IPA[ˌpirēˈädəkəl səˈkādə]

   • n.
     an American cicada whose nymphs emerge from the soil in large numbers periodically. The mature ...

   Oxford American Dictionary