For example, according to the different social strata of consumers, travel agencies have to develop high-end consumer travel planning or cost-effectivetravel 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；
2
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。
3
Surely if an alien civilization is advanced enough to master space travel, it can devise more effective ways of communicating with us.