There are two important points regarding sampling: a regular volume is sampled since repeated sampling is required;

关于采样有两个重要的点：定期体积被采样，因为需要重复采样；

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Methods Evaluations of cost-benefit for one group repeated sampling data and pairing design of repeated sampling have been explored.

方法探讨单组重复采样设计及配对重复采样设计的成本效益评价。

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In repeated sampling of a time varying population, the use of previous survey results can improve the present survey results or save the survey costs.

对一个时变总体进行经常性调查时，利用前次查的结果，可以提高本次调查结果的精度，节省调查的费用。

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Repeated sampling was conducted at four wells where EPA was delivering temporary water supplies as a precautionary step in response to prior data indicating levels of contaminants that potentially posed a health concern.

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