只有在实验的最后阶段要求比较两部电影的时长时，“回程效应”才起效。

It was only when asked to compare the two films at the end of the experiment that the 'return trip effect' kicked in.

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以前我们认为产生这种“回程效应”的原因是我们对回程的路线更加熟悉，而科学家们却认为是因为期望的不同。

Scientists believe this "return trip effect" is not caused by being more familiar with the route on a return journey, as previously thought, but because of different expectations.

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为了研究这一名为“回程效应”的现象，科学家让20人摘下手表，观看两部影片，影片间隔十分钟。

To study the 'return trip effect', as it is called, they asked 20 men to take off their watches and view two films, ten minutes apart.

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