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问题: every half hour

They leave Trebirch every half hour on weekdays and every houre at weekends.
我想请问every half hour这说法是错的啊 如果是半个小时 应该是half an hour 啊??

解答:

every 是关键

我们说: every day 每天 , every hour 每小时 ,
every year 每年

every haolf hour 每半小时