由于 biennial 也有 每两年一次 ( once every two years )的意思，也最好避免用。
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Jeff: Oh. It is held once every two years.
杰夫：噢，原来是每两年举行一届。
youdao
The Council conferences are convened once every two years.
理事会每二年举行一次会议。
The soldiers will go home on leave once every two years.
士兵们每两年回家休假一次。
The meetings used to be held about once every two years.
VOA: special.2009.06.03
The Times pulled data released by the Bureau of Labor Statistics once every two years.
FORBES: Jobs of the Future
He argues is that Apple likes to bring out a truly updated device once every two years.
FORBES: Will The Samsung S4 Launch Drive Apple's Share Price Down?
Once every two years, Mr. Ehrmann, who is 50, organizes a festival, during which artists display new works and hold happenings.
WSJ: French Artist Thrives on Chaos, Neighbors Are Less Enthralled
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