We all know that slacking off on dental hygiene is the first way to get cavities, but stress can also be a culprit, say experts, especially when you’re grinding your teeth at night or during the day.

我们都知道对牙齿保健的懈怠是诱发龋齿的第一因素，但专家称压力也可能导致龋齿，尤其是当你晚上或白天磨牙时。

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In order to track temporal hours during the day, inventors created sundials, which indicate time by the length or direction of the sun's shadow.

为了在白天追踪时间，发明家发明了日晷，它通过太阳阴影的长度或方向来指示时间。

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The coughing with asthma can occur during the day or at night.

哮喘咳嗽可发生在白天或晚上。

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Some are special party boats. These go out for the day or during the night.

VOA: special.2010.03.22

But we pride ourselves generally on 5 or so minute response times at most hours during the day.

但是我们很光荣的告诉大家大多数的时间,我们都能在5分钟左右对大家的问题做出回答。

哈佛公开课 - 计算机科学课程节选

"Now we have what we would call rush hour conditions or peak travel conditions for as much as eight hours during the day - about three to four hours in the morning and similar time in the evening."

VOA: standard.2010.07.26

If you want to eat or drink during the day, make sure it is in a private place.

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Each can simulate 50 to 100 shopping transactions at once, whenever a PC is unused for six minutes or so during the day and continuously at night.

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According to the National Sleep Foundation's 2004 Sleep in America poll, 13% of school-age children have difficulty falling asleep at bedtime and 26% of preschoolers seem sleepy or overtired during the day at least a few days a week.

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