happening one time each week/month/year etc 一星期/一个月/一年等一次 The amateur golfers from Europe only get together once or twice a year. 欧洲来的业余高尔夫球手们每年只相聚一两次。
How often do you use the Internet? Daily? Once a week? 你多长时间上一次因特网?每天?每周一次?
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