Translate the following passage into Chinese.Travelers of interest to the industry are usually classified into those whose travels require the use of overnight accommodation and those whose trips last less than one day. As can be noted in the WTO definitions， these groups are further divided into international travelers and domestic travelers. A major reason for this distinction is that most nations are especially interested in developing tourism as an export industry. Export industries promote national economic development by generating new wealth for the state. Domestic tourism may be important for local or regional development， but many economists suggest it usually has the effect of merely shifting wealth from one region to another， and not of contributing to actual net growth in the gross domestic product of a country. Some national tourism organizations have found it useful to make a further distinction between intercontinental travel and travel between adjacent countries.