triennial

The contemporary art museum's 2015 Triennial, titled "Surround Audience," is in full swing, showcasing more than fifty-one artists from twenty-five countries around the world.

在这座现代艺术博物馆里，一场名为“围观”（Surround Audience）的2015年度三年展（2015Triennial）正在如火如荼地进行当中，全世界共有25个国家的超过51名艺术家参展。

An employee of the OECD, he is the man in charge of Pisa, a triennial assessment that measures the performance of children across 65 countries and regions.

作为经合组织（OECD）的一名职员，他负责掌管国际学生评估项目（简称PISA），这是一个每三年举办一次的测试项目，考察65个国家和地区学生的能力表现。

I applied this phrase to the role of the fund in a paper I submitted to its 2011 triennial surveillance review. At the annual meetings in Tokyo, the fund fulfilled precisely this role.

在为国际货币基金组织2011年度的三年工作评审提交的论文中，我也用这几个词来描述该组织的作用。