For example, according to the different social strata of consumers, travel agencies have to develop high-end consumer travel planning or cost-effective travel services;

例如，可以根据消费者的社会阶层不同，制定出高端消费旅游计划或者性价比高的旅游业务；

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More consumers travel longer distances to and from work, which also makes out-of-home advertising effective.

越来越多的消费者通勤的距离越来越远，这也使得户外广告的效果更好。

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Surely if an alien civilization is advanced enough to master space travel, it can devise more effective ways of communicating with us.

自然地，如果有外星人文明已先进到可以掌控太空旅行，它可以通过更有效的途径与我们交流。

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We even took a series of valuable classes on effective travel photography.

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Mr Brown also said the government's ambition was that workplaces with more than 30 employees should have an effective travel plan by 2022 in place to help achieve substantial reductions in commuter trips in single-occupant cars.

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But given all the wishes we heard for faster travel, from "effective baggage handling" to "travel at supersonic speeds, " once we have somewhere to visit in outer space, we think travelers would rather just use their teleportation machines.

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