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- 每三年的每三年出现一次的，三年一次的Occurring every third year.
- 社会伙伴会议三年一次的协商会议;Triennial Consultative Conference of the Social Partner Conference;
- 课程为持有有效急救证书的职员延长其急救员的资格,每三年一次。The course is for the qualified first-aiders to extend their qualification on every three years.
- 三年three years
- 一个随植物生长而出现的一年一次的形状。an annual formation of wood in plants as they grow.
- 比尔在一连三年的足球赛季中都是预备队员，他希望教练今年会让他参加比赛。Bill has been warming the bench for three football seasons; he hopes that the coach will let him play this year.
- 一年一次的比赛项目a yearly event
- 她想要继续记录,但却再一次的被他打断了。“他为什么会失眠?She tries to go back to her paperwork, but he interrupts again. "Why wasn't he sleeping?
- 有,少于每三年一次Yes, less frequent than once every three years
- 尽管寡不敌众，他们还是抵挡住了敌人（一次又一次的进攻）。Though outnumbered, they held off (repeated attacks by) the enemy.
- 开始每两年一届，1927年第8届后改为三年一届，第9届后改为四年一后，与奥运会相间举行。At the be-ginning,the games were held once every two years. After the 8th Asian Games (1927),it was changed into once every three years.From the Ninth Games,it was changed into once every four years,which was held in the intervals of the Olympic Games.
- 由防御部队从进攻部队那里抓住主动的大范围进攻（多于一次的反击）。a large scale offensive (more than a counterattack) undertaken by a defending force to seize the initiative from an attacking force.
- 他在巴黎三年一度的跑马比赛中囊括全奖。He swept the board in the triennial races in Paris this season.
- 一年两次的;半年一次的Happening twice each year;semiannual.
- 母混血儿能在这二种极端之间的任何时候达成性成熟,和每年有一次或者二次的发情期。The female hybrid can reach sexual maturity at any time between these two extremes, and can have one or two estrus cycles per year.
- 国际结算银行三年一度的外汇与衍生工具市场成交额调查结果Results of Bank for International Settlements Triennial Survey of Foreign Exchange and Derivatives Market Turnover
- 推进器转一圈的距离飞机螺旋桨旋转一次的前移距离，以其与螺旋桨相平行的距离衡量The distance that a propeller would travel in an ideal medium during one complete revolution, measured parallel to the shaft of the propeller.
- 根据国际结算银行每三年一度的调查，香港在1998年以成交额计算是全球第七大外汇市According to a survey made by the International Settlement Bank once every three years, in 1998 Hong Kong's exchange market came seventh in the world in terms of transaction volume.
- 运动会每三年举行一次.The games occur triennially.
- 在阿拉摩战役中，不满二百人的守军在十二天内击退了几千墨西哥人一次又一次的进攻。In the Alamo battle, less than two hundred defenders repulse the attack by thousands of Mexican in twelve days.
