Starting at the top of Listing 3, policies are valid for a set period of time.

首先从清单3的顶部开始，策略在一个固定时间段内有效。

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The calculating formulation of the period for the main handle to remain at position "1" is derived. It provides a scientific basis for smooth operation when starting the train.

推导出列车起动时主手柄在1位停留时间的计算公式，为列车起动时平稳操纵提供科学依据。

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The starting point and growing source of the contemporary on the spot writing style is the reportage which springs up rapidly at the new period.

新时期迅猛崛起的报告文学，是当代纪实文学文体的出发点和生长源。

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Up to 400, 000 children will be vaccinated during a six-week period, starting in 2014 at the earliest.

BBC: Flu vaccines for children in Northern Ireland

But he added this would see 1, 330 fewer employees at its Montreal-area facilities and at its Belfast site over a nine-month period starting October 2006.

BBC: NEWS | UK | Northern Ireland | 645 jobs going at aerospace firm

But it might be more instructive to look at the years between those two offices, a period starting in 2002 after a failed bid for lieutenant governor.

NPR: Alaska Welcomes Palin Back Home