The group says it could be hard to stop experimental organisms from entering the natural environment.

VOA: special.2010.07.20

You're now in the experimental group and I say, "Please wait here.

你现在是实验小组的一员，我说，“请稍等。

耶鲁公开课 - 心理学导论课程节选

When we do experiments, each group of three has an experimental setup to measure the phenomenon.

当我们做实验的时候，每个三人小组建立实验设备,来测量观察的现象。

麻省理工公开课 - 媒体、教育、市场课程节选