课外活动反映了皮尤研究中心育儿方式的差异，这是从对全国1807名家长的代表性抽样调查的结果。
Extracurricular activities reflect the differences in child-rearing in the Pew survey, which was of a nationally representative sample of 1,807 parents.
抽样问题：有关源和代表性样品的证据，你的听众和您使用的是形成清晰的推论并得出结论。
Sampling issues: clarity about the source and representativeness of samples of evidence that your audience and you are using to form inferences and draw conclusions.
ADC的前提是根据抽样的一小部分表数据自动创建一个代表性的压缩字典。
The premise behind ADC is to automatically create a representative compression dictionary based on sampling a small subset of table data.
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