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。

youdao

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。

youdao

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。

youdao