They could only listen. In late June,eighteen sixty-five, the trial of Abraham Lincoln's assassins ended.

VOA: special.2010.01.07

Now, what happens is half of the participants in the experiment who have listened to each of these tapes-- You only get to listen to one tape.

这时，发生了一件事儿,他们要求半数的受访者,听过这些磁带的人-,只能听磁带。

耶鲁公开课 - 心理学导论课程节选