adj.每三年一次的，每三年的
n.每三年举行一次的纪念节(等)；【植】三年生植物

The cherry trees bloom triennially, alternating between two and three years.
樱花树每三年开一次花，有时是两年，有时是三年。
This species of plant is known to have a triennial life cycle.
这种植物的生命周期为三年。
The festival is held every triennial, drawing visitors from all over the world.
这个节日每三年举行一次，吸引了世界各地的游客。
The artist's paintings are exhibited triennially in major museums.
这位艺术家的作品每三年在主要博物馆展出一次。
The contract has a triennial renewal clause, allowing for automatic extension every three years.
合同有每三年续签一次的条款，允许自动延期三年。
The organization's board meets triennially to review its strategic plans.
该组织的董事会每三年会召开会议，审议其战略计划。
His research project was funded for a triennial period, lasting three consecutive years.
他的研究项目获得了为期三年的资助，连续三年进行。
The college offers a triennial degree program in environmental science.
学院提供一个每三年更新一次的环境科学学位课程。
The garden's layout is planned on a triennial basis, with plants grouped by their blooming periods.
花园的设计每三年规划一次，植物按开花期分组。
They decided to hold the conference triennially to reduce costs.
他们决定每三年举办一次会议以节省费用。