By timing how long the signal takes to make the return trip, the instruments can determine differences in height.

通过计算信号往返需要的时间，仪器可测定差距高度。

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The settlers would be sent supplies from Earth, but would go on the understanding that it would be too costly to make the return trip.

移居者将得到发自地球的给养，但是他们先要理解，返程之旅过于昂贵。

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Professor van de Ven said: 'These findings on the return trip effect can help us make new predictions on how people experience the duration of tasks, even those unrelated to travelling.'

教授van de Ven 说：“我们所发现的‘归途效应’帮助我们更好的了解在处理任何事情中期望值对结果产生的心理影响，这种影响并不局限在旅途过程中。”

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By timing how long the signal takes to make the return trip, the instruments can determine differences in height.

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If you're living in a country where you have to walk for several hours or even a day to get to a clinic it's extremely unlikely you would bother to make the return trip a week later to get the result of a check-up.

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By the time of the return trip, the two sides may be in position to make further progress.

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