...信号处理技术，必须将，在时间轴上的离散点取值，记为：x（nt），I表示相邻两点之间的时间间隔，又称抽样周期（sample periodic），即： x（玎乃），行＝一Ⅳ1．…，-1，0，1，…
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periodic sample 周期性取样
periodic sample functions 周期性样本函数
sample periodic
样品周期
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Instead, they are considering gathering information from the vast, centralised databases held by government, such as tax records, benefit databases, electoral lists and school rolls, as well as periodic polling of a sample of the population.
ECONOMIST: The traditional census is dying, and a good thing too
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