这样一来，由于无法获得随机的抽样，投票只能反映各激进组织的组织技巧和精力。
Instead of getting a random sample, your poll will reflect the activist groups' organizational skills and energy level.
定义和应用确保数据准确和完整的技巧，如随机抽样法、分层抽样法、样本同质性等。
Define and apply techniques for assuring data accuracy and integrity such as random sampling, stratified sampling, sample homogeneity, etc.
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