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前面可以不用,例如:
1、The Tourist Board inspects all recommended hotels at least once a year.旅遊局至少每年視察一次所有舉薦的旅館。
2、The snake sheds its skin once a year.蛇一年蛻一次皮。
3、Many people have made it a rule to detoxify once a year.許多人已經養成了每年進行一次身體排毒的習慣。
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