recurring every three years
三年一现的
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the triennial meeting of the Association. 三年一次的联盟会议。
lasting for or relating to a period of three years
持续三年的;与三年有关的。
a visitation of an Anglican diocese by its bishop every three years
(英国国教主教对其教区)每三年一次的巡视。
"mid 16th cent.: from late Latin