In fact, tourism is a highly demand-driven industry, and it is characterized by high vulnerability to external factors such as natural risks, threats to health and security and simply fashion.
事实上，旅游业是需求驱动程度极大的一种行业，它的特点是非常容易受到自然风险、健康与安全方面的威胁或者仅仅是“时尚”的影响。