... quota限额；配额 quota a sampling定额抽样 racial l group种族群 ...
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quota a sampling
配额抽样
以上为机器翻译结果，长、整句建议使用 人工翻译 。
All the polling firms selected their samples using a technique known as quota sampling.
ECONOMIST: Why the polls got it wrong last time
Using old-style quota sampling Gallup's polls had shown a Labour lead of 37 points.
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