| 单词 | 每三年 |
| 释义 | DEFINITIVE EXAMPLES 权威例句〔mandatory〕The Council has made it mandatory for all nurses to attend a refresher course every three years.理事会要求所有护士必须每三年参加一次进修课程。朗文当代〔reconvene〕The association reconvened the conference every three years.这个协会每三年召开一次会议。韦氏高阶〔refresher course〕The staff is required to take refresher courses every three years.员工每三年要参加一次进修班。韦氏高阶〔triennial〕A ceremony or celebration occurring every three years.每三年发生一次的事件、仪式或庆祝活动美国传统〔triennial〕Occurring every third year.每三年的：每三年出现一次的，三年一次的美国传统 |
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