A particular animal typically maintains its own characteristic cycle duration with great precision for many days.

某一种动物通常可以在很多天内极其精确地保持其特有的周期时间。

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These periods became known as temporal hours, because their duration varied according to the changing length of days and nights with the passing of the seasons.

这些时段被称为“日光时”，因为它们的持续时间随着不同季节而带来的昼夜长短的变化而改变。

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Business processes can execute their activities in sequence or in parallel, over a very short period of time, or a much longer duration spanning days, weeks or longer.

业务流程可以按顺序或并行执行它们的活动，执行期限可以是较短的时间，也可以是跨数天、数周或更长的时间。

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"There is increased evidence that it helps shorten the duration of the common cold sometimes even by two to three days."

VOA: special.2011.04.20

Today, the Washington Post reported, not for the first time, that taking zinc will shorten the duration a cold by three days in adults.

FORBES: Zinc Versus Chicken Soup, Round Two

Its benefits -- shortening the duration of illness by one to two days and reducing viral excretion from the nose -- are modest, he said.

CNN: Feds update H1N1 antivirals guidelines

Go to the site's vacation budgeting estimator and punch in your destination, the number of days you'll stay, the duration of your trip, number of people travelling and related information.

BBC: Tracking travel rewards