Why do airlines charge less for a round-trip trip ticket if the traveler stays over a Saturday night?

为何如果旅客周六停留一晚，航空公司对往返机票的收费就要低？

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Trip includes round-trip air tickets, hotel stay for two nights, and tours of the National Air and Space Museum and the office of National Geographic World.

行程包括往返机票、两晚的酒店住宿、国家航空航天博物馆和国家地理世界办公室之旅。

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Before his trip was over, he wanted to take something away to remember his trip here.

在他的旅行结束之前，他想带走一些东西来纪念他在这里的旅行。

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Once,on a business trip to London, Charles Homer bought a set of drawing examples for his son to copy.

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When he gets back to New York, finally, at the end of this first road trip, he has missed Dean.

当他终于回到纽约时，在这首次旅途的末期，他弄丢了迪恩。

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And so, when we took a field trip to go see the SF Chronicle, it was really, really sad.

我们去《旧金山纪事报》的报社看过，发现他们真的很萧条。

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The cost of trip cancellation policies is typically about 5% of the total trip cost.

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The trip went as smoothly and uneventfully as an airline trip could go--and should go.

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Everything on this trip evolved in 12-hour clips, and our trip was no different.

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