More bias likely from extraneous variables, due to greater difficulty of controlling all aspects of experiment outside the laboratory.
可能会有来自额外变量的更多的偏差，因为在实验室外控制实验的所有方面有很大困难。
Wary of these possible criticisms, Rule and Ambady conducted a second experiment that controlled for such extraneous variables as self-presentation and hairstyle.
处于对这些批评的谨慎，rule和ambady实施了第二次实验以控制外部变量，例如自我表现和发型。
It usually leads to more compact programs with fewer extraneous variables, because parameters can be treated as conveniently initialized local variables in the called routine.
可以看出，按值调用的目的是为了方便函数编写者，因为参数可以被当作已经初始化过的局部变量来使用，从而使程序更简洁。
Internal validity: the degree to which the results of a study can be attributed to the treatment rather than extraneous or confounding variables.
内部效度：一个实验结果归咎于实验处理，而非归咎于无关的混淆的变量的程度。
Internal validity: the degree to which the results of a study can be attributed to the treatment rather than extraneous or confounding variables.
内部效度：一个实验结果归咎于实验处理，而非归咎于无关的混淆的变量的程度。
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