triennially

例句：

1. 1. The company plans to hold a conference every triennially.
   公司计划每年一次召开会议。
2. 2. We will visit the museum every triennially.
   我们将每年一次参观博物馆。
3. 3. The team has been working together for three years and is planning to continue their triennially.
   这个团队已经合作了三年，并计划继续他们的年度活动。