求翻译：研究可持续旅游的著名学者巴特勒，早在1993年他出版的专著中对可持续旅游做过这样的定义：“可持续旅游是指一个地区的旅游开发和延续，以这样的方式和规模发展，即在无限长的时间内旅游开发不改变或降低环境质量(包括人文和自然的)以及处在这个环境中的人类活动和进程都能得以顺利地实现”。是什么意思？

Well-known scholar of sustainable tourism Butler, back in 1993 he published a monograph on sustainable tourism has done such a definition: "Sustainable tourism is an area of ​​tourism development and continuity, in such a manner and scale of development , that is infinitely long time in tourism deve

Research on sustainable tourism, the famous scholar Butler as early as in 1993, he published a monograph on sustainable tourism has done under such a definition: "Sustainable tourism is an area of tourism development and continue to do so, and that is the manner and scale development within the infi

Studies the sustainable traveling renowned scholar Boteler, as early as to the sustainable traveling has made such definition in the monograph which 1993 he publishes: “The sustainable traveling is refers to an local the traveling to develop and to continue, by such way and the scale development, na

Research may continued tourism of famous scholars Butler, early in 1993 he published of monograph in the on may continued tourism do had such of defined: "may continued tourism is means a area of tourism development and continued, to such of way and scale development, is in unlimited long of time wi

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