triennial

adj.

三年的，每三年一度的；

n.

三年生植物，三年一次的事物；

1. We signed a triennial contract yesterday.
   昨日我们签了一项三年的合约。
2. This information is preserved in 25 triennial registers.
   这些信息保存在25份三年一度的户册里。
3. He swept the board in the triennial races in Paris this season.
   他在巴黎三年一度的比赛中囊括全奖。

Triennial Review of the National Nanotechnology Initiative
The 2001 Triennial Central Bank Survey of Foreign Exchange and Derivatives
Triennial Central Bank Survey Foreign exchange and derivatives market activity in 2007
Triennial review annexes to main report: National Institute for Health and Care Excellence
Triennial Growth Symposium: important roles for L-glutamine in swine nutrition and production.
A matter of size: Triennial review of the national nanotechnology initiative
Triennial Central Bank Survey of Foreign Exchange and Derivatives Market Activity in 2010—Final Results
Why Has FX Trading Surged? Explaining the 2004 Triennial Survey
Chemistry of the adaptive mind: One contribution of 17 to a Triennial Issue 'Chemistry and life science'
An online prepurchase intentions model : The role of intention to search: Best Overall Paper Award—The Sixth Triennial AMS/ACRA Ret...