Why does the quality of tour guide service play a symbolic role in the quality of tourism service?

The quality of tour guide service includes the quality of tour guide's explanation, the quality of life service for tourists and the quality of implementing various tourism activities. Tour guides and tourists live together day and night, so tourists have the most direct contact with the tour guide's service, the deepest feeling and the most sensitive response to its service quality. Generally speaking, if the quality of tour guide service is high, it can make up for some shortcomings of other tourism services, while if the quality of tour guide service is poor, it can't make up for its bad influence. Therefore, the success or failure of tourism activities depends more on the service quality of tour guides. The quality of tour guide service is not only related to the quality of the whole tourism service, but also related to the reputation and image of the national or regional tourism industry.