And testers threw large, inflatable dolls - representing children - in front of the cars at random mements to test the driver's reaction time.

VOA: standard.2010.06.24

Here's a way that you can do it in a test tube without using any cells by this process called Polymerase Chain Reaction.

但有一个方法可以让你在试管中完成,不用细胞,这个方法叫聚合酶链式反应

耶鲁公开课 - 生物医学工程探索课程节选