All organs, above and under ground, of a fruit tree is an unified organic body, In cold and dry regions, the growing period duration is short.

果树的地上下部是一个统一的有机体。干寒地区果树生育期短。

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Whereas the cache API is designed to cache data for a long period or until some condition is met, per-request caching simply means caching the data for the duration of the request.

缓存api的设计目的是为了将数据缓存较长的一段时间，或者缓存至满足某些条件时，但每请求缓存则意味着只将数据缓存为该请求的持续时间。

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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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The view of another senior Treasury official, Under Secretary David Mulford, (expressed on the record at the London Economic Summit) to the effect that a currency stabilization fund for the Soviet Union would not be possible for at least 2-3 years -- a period of sufficient duration to permit structural reforms to precede ruble convertibility, will probably go by the boards within 6-9 months.

CENTERFORSECURITYPOLICY: Center For Security Policy

Will keeping vaccine induced immunity high for a longer period of time increase the duration of protection?

WHITEHOUSE: HIV Vaccine Awareness Day, 2011

Over past crises, the duration of the period of rising unemployment averaged nearly five years, with a mean increase in the unemployment rate of seven percentage points, which would bring the U.S. to double digits.

WSJ: Opinion: Expect a Prolonged Slump