应该采取适当的措施限制外国旅游者的数量努力保护当地环境和历史不受国际旅游业的不利影响
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 effects of international tourism
以上为机器翻译结果，长、整句建议使用 人工翻译 。
应该采取适当的措施限制外国国旅游者的数量，努力保护当地环境和历史不受国际旅游业的不利影响。
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 effects of international tourism.
应该采取适当的措施限制外国旅游者的数量，努力保护当地环境和历史不受国际旅游业的不利影响。
Proper amounts must be taken to limit the digit of exotic passengers and the great exertions should be made to defend local context and history from the noxious effects of multinational tourism.
我们应该采取适当的措施限制外国旅游者的数量，努力保护当地环境和历史不受国际旅游业的不利影响。
We must take proper measures to limit the number of foreign tourists and we should make great efforts to protect local environment and history from the harmful effects of international tourism.
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