quadannual

形容词 adj.

英文释义

形容词 adj.
  1. Once every four years; quadrennial. not-comparable,rare
    — Under mounting pressure from native people, who began attending their quadannual conventions in the mid-1970s, both the World Conservation Union (IUCN) and World Parks Congress have voted by wide majorities their approval of […]

词源

From quad- + annual.
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