intervals
['ɪntevl]
n.
[军事]间隔( interval的名词复数 );
间隔时间;
[数学]区间;
（戏剧、电影或音乐会的）幕间休息;
例句:
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Check the oil at regular intervals, and have the car serviced regularly.
定期检查汽油，并对车辆进行定期维护。
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George struggled wildly, going under and resurfacing at regular intervals.
乔治疯狂地挣扎，不断在水面上浮浮沉沉。
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Make a point of backing up your files at regular intervals.
一定要定期备份文件。
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Try dollar-cost averaging -- purchase units at regular intervals.
来自CNN
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This process may need to be repeated at intervals.
来自BBC
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Feet Wash and dry your feet at regular intervals.
来自THETIMES