名词
中文翻译：定期间隔
同义词：
['periodic interval', 'regular interval例句：1. The train arrives at the station every hour on the hour.（火车每小时到站一次。）']
例句：
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1. The train arrives at the station every hour on the hour.
火车每小时到站一次。
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2. The teacher gave us a regular interval to rest before the next class.
老师给我们安排了一个休息时间，以便在下一节课前休息。
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3. The team practiced regularly interval training during the off-season.
球队在休赛期进行了定期间歇训练。