第三輪翻譯

To do such an experiment, scientists set up two groups. One is an experimental group in which a chosen variable is changed in a known way and the other is a control group in which the chosen variable is not changed. With proper experimental design, any difference between the two groups should result from the variable that was changed in the experimental group.




像這樣的實驗，科學家都分成兩組。一組是實驗組，是用已知的方法改變的可變性因素，另一個是控制組，是不能改變的可變性因素。用正確的實驗設計，任何在這兩組的不同之處應該是因為在實驗組所改變的變因。