答：自2000年来，零售旅行社的数量已经减少了三成。
A: Since 2000, there has been more than a 30% decline in the number of retail travel agencies.
《美国消费者满意指数——电子商务类》报告通过三个主要的电子商务分类（在线旅行社、在线经纪和电子零售网站）分析顾客满意度。
The American Customer Satisfaction Index E-Commerce report analyzes customer satisfaction with three major, e-commerce groups: online travel, online brokerage and e-retail.
此种理论的优秀先驱是在线书商和旅行社：随着主零售店的广泛吸引力，他们也可以提供个性化的服务。
The classic pioneers of this approach are the online bookseller or travel agent: with the mass appeal of a major retailer, they can also offer a personalised service.
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