Trees may use several quarts a day, so check the water level in the stand every few hours.

一棵树一天要消耗好几夸脱的水，所以你得隔几个小时就检查一次架子里的水位。

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Check back in a few hours to compare the rate of decay and the resulting smells.

几小时后，比较两者的腐烂速度和气味。

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Travelers using a mobile phone or web-enabled mobile device can check in for their flights at mobile.united.com starting 24 hours before departure.

旅行者可以在飞机起飞的24小时以前通过移动电话或者可上网的移动装置，在mobile.united.com上办理登机牌。

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Merchants that used to only see three hours of check-in data will now be able to see a longer history.

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Fortunately Forbes kept me on while I kept my hours in check.

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Mr. Graff says the most important lesson he has learned is how to be flexible, including allowing employees to work unconventional hours and to check in from home or a coffee shop.

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