Vous avez cherché: triannually (Anglais - Chinois (simplifié))

moreover, certain agenda items should be considered biannually or triannually, while the obsolete ones should be deleted altogether.
此外，某些议程项目应该每两年或每三年审议一次，过时的议程项目则应完全取消。

escap web page on social development (www.unescap.org/esid) (updated triannually)
亚太经社会社会发展网页(www.unescap. org/esid)(一年更新三次)

(v) technical material: database on social development policies and good practices (updated biannually) (1); escap web page on social development (http://www.unescap.org/esid) (updated triannually) (2); regional survey on ageing in preparation for the follow-up to the madrid international plan of action on ageing (1); regional survey on the programme of action of the world summit for social development (1); survey on disability in preparation for the end of the asian and pacific decade of disabled persons, 2003-2012 (1); e-working paper series on social development, including social protection and social justice and gender equality and empowerment (2);
㈤ 技术材料：关于社会发展政策和良好做法的数据库(一年更新两次)(1)；亚太经社会社会发展网页(http://www.unescap.org/esid)(一年更新三次)(2)；为准备贯彻《马德里老龄问题国际行动计划》的老龄问题区域调查(1)；《社会发展问题世界首脑会议行动纲领》区域调查(1)；为准备1993-2002年亚洲及太平洋残疾人十年结束的残疾调查(1)；关于社会发展的电子工作文件系列，包括社会保护与社会正义、两性平等与赋权(2)；