（1）试验因素（experimental factor）：试验中，凡对试验结果可能产生影响的原因或要素，都称为因素。试验中研究的影响试验结果的因素称为试验因素。
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分析了几种试验因素对产品收率和纯度的影响，并从硝化作用的角度对这些影响进行了探讨。
The effects of experimental factors on both product yield and purity were analyzed and investigated from the point of view of nitration.
研究结果表明：在所考察的试验因素中，含水量对粘附力的影响最大，其次为土壤载荷和载荷作用时间。
The results showed that soil moisture content, normal load, load dwelling time, and their interactions had important influence on the soil adhesion.
试验研究中不可缺少的三项内容分别是试验因素、受试对象和试验效应，通常将他们称为试验设计的三要素。
The three indispensable terms in an experimental research are: experimental factors, subjects, and experimental effects, which are generally called three principles of an experiment design.
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