This occurs biennially, as in many fruit trees.
象多种果树那样二年发生一次。
Faecal occult blood testing had to be repeated (annually or biennially).
粪便潜血检查需要重复进行(每年一次或每两年一次)。
Expert proposal, pillow core at least biennially is changed, bask in every week.
专家建议，枕芯至少每两年换一次，每周都晒一次。
Since then it has held conferences biennially with sponsorship from host countries and other parties.
自此，主办国和其他人士每两年便赞助举行该会议。
Since then it has held conferences biennially with sponsorship from host countries and other parties.
自此，主办国和其他人士每两年便赞助举行该会议。
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