In order to conduct a clinical trial properly, scientists need to be able to minimize interference from confounding variables, things that influence final measurements, without being the variable of interest.

为了正确地进行临床试验，科学家们需要能够最大限度地减少来自混杂变量的干扰——这些变量影响最终测量，而不是兴趣变量。

Stephen rose to go and take a few final measurements at the church, the vicar following him to the door with a mysterious expression of inquiry on his face.

斯蒂芬起身去教堂做最后的测量， 牧师跟着他走到门口， 脸上带着神秘的询问表情。