研究发现，在（学生）种族比例和（家庭）经济水平趋于平衡的双语课堂有助于孩子们适应社会和文化的多样性。
Ethnically and economically balanced bilingual classrooms are found to be helpful for kids to get used to social and cultural diversity.
然而，正是这种多样性的性质使旅游业成为许多国家、区域或社区经济发展的理想工具。
However, the nature of this very diversity makes travel and tourism ideal vehicles for economic development in a wide variety of countries, regions or communities.
旅游业本身的多样性和碎片化是其隐藏或掩盖其经济影响的主要问题。
The major problems of the travel and tourism industry that have hidden, or obscured, its economic impact are the diversity and fragmentation of the industry itself.
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