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.

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。

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Note that in a closed universe you could start a journey off in one direction and, if allowed enough time, ultimately return to your starting point; in an infinite universe, you would never return.

请注意，在一个封闭的宇宙你可以朝着一个方向开始旅行，如果允许足够的时间，最终将返回到出发点；而在一个无限的宇宙中，你永远不会回来。

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On the return journey through India, Alexander came across a new town with high walls.

在回程的旅途中，经过印度，亚历山大穿过了一座建有高墙的新城。

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The number of cars using the bridge, at 9, 000 a day, is much lower than expected because tolls are steep (SKr500 for a return journey), and cross-border traffic is building up only slowly.

ECONOMIST: Borderless

It said passengers delayed by 300 minutes or more would be offered a free return journey in the same class of travel as well as a cash refund for the delayed part of the journey.

BBC: Delayed passengers arrive at St Pancras

Car parking charges and mileage from Newquay to Exeter are also covered, as is the return journey on a Monday.

BBC: Peter Lawrence-Roberts