Clinical trials take a long time because they're rigorously controlled, with close attention paid to sampling bias and methodology.
临床试验需要花费很长时间，因为它们处于严格控制之下，必须密切留意取样偏差与方法。
Tests showed that the average yield per mu obtained by typical mode sampling was more close to the average yield per mu actually measured in blank test than that obtained by random sampling.
试验结果表明，典型众数抽样较同时同地进行的随机抽样平均亩产量更接近空白试验所测得的每亩平均产量。
The results indicate that the entirety sample linearity model is the most suitable model, and the price is close to the sampling point land price average method.
分析结果表明，构建的整体样本和分级别样本农地的五种模型中整体样本的线性函数模型为最适模型，且线性函数模型与样点地价平均法结果基本持平。
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