The activity duration of crop is about 40 days, two times the period.

作物旺盛生活期为40天，相当于两个周期。

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There is a five second activity duration to account for the serial transfer of data to the printer.

需要用五秒钟的活动持续时间来安排到打印机有序传输数据。

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A. Lengthen the estimated activity duration for all activities scheduled to occur the following winter.

把以后几年冬季要发生的所有活动的估算历时都加长。

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In addition, parents can actively monitor their child's online activity, limit play time duration and provide a virtual allowance for purchasing apps via MEEP!

ENGADGET: Oregon Scientific MEEP! tablet ships for $150, gives kids a safe, exclamation-filled place to play

In technology, a stateful activity or session sets an agreement for all the resources along the path of process flow to be solely assigned for the duration of the activity.

FORBES: Is Your Employment Model Too Stateful?

Sleep duration did not significantly affect cancer risk for women of any age in the lower physical activity bracket.

CNN: Exercise plus sleep may lower cancer risk in women