应采取适当的措施限制外国游客的数量，努力保护当地环境和历史不受国外旅游业的不利影响。
Proper measures must be taken to limit the number of foreign tourists and the great efforts should be made to protect local environment and history from the harmful efforts of international tourism.
通过与国外旅游业以及其他产业制度演进过程的比较，本文归纳出中国旅游业制度变迁的四个特点。
Through the comparison with foreign tourist industry and other industries, this text sums up four characteristics for the Chinese tourist institutional changes.
旅游业是该国外汇收入最高的行业。
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