| 单词 | quadrennial | 
| 释义 | quadrennialadjective  qua·dren·ni·al  kwä-ˈdre-nē-əl  1   : consisting of or lasting for four years   2   : occurring or being done every four years    quadrennial noun   quadrennially   kwä-ˈdre-nē-ə-lē adverb | 
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