行级的抽样读取所有数据页，但是只考虑每页上一定百分比的行，因此只包含相应xda页面中的一部分。
Row level sampling reads all data pages but considers only a percentage of the rows on each page, and therefore only a subset of the corresponding XDA pages.
考虑到为启动有针对性的——权且不提地毯式的——全球级免疫规划所需的努力和资金，单靠哨点抽样是不够的。
Given the amount of effort and funds needed to launch a targeted - let alone a blanket - immunization programme at the global level, sentinel sampling is not enough.
针对换热器的失效分析，考虑几种主要参数的不确定性和随机性，应用蒙特卡罗模拟法抽样计算了服从某种特定分布的随机变量。
Through failure analysis of heat exchangers and in consideration of uncertainty and randomness of several main parameters, the random variables are calculated by Mote-Carlo modeling.
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