尽量取得目标群体的随机抽样。

Try to a achieve a random sample of the target audience.

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同时，在江苏省扬州市郊区简单随机抽样49只长江三角洲白山羊作为对照群体。结果表明。

At the same time, 49 Yangtse River Delta White Goats were sampled as contrast population from the suburb of Yangzhou city Jiangsu province by the simple random sampling method.

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同时研究表明，系统随机整群抽样是进行黄牛群体遗传变异分析的最适抽样方法。

Also the results showed that the Stratified Random ClusterSampling is an adequate sampling method for the genetic variation analysis of yellow cattle population.

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