求翻译：　　生态效益是生态旅游可持续发展的前提条件和物质基础;社会效益是生态旅游发展的原始动力;经济效益则是生态旅游开发和经营的重要拉力,从中起主导作用。三大效益都是生态旅游发展不可或缺的条件。是什么意思？

Eco-tourism eco-efficiency is a prerequisite for sustainable development and material basis; social benefits is the original driving force of eco-tourism development; economic development and eco-tourism is an important pull operation, from which play a leading role. Three benefits are indispensable

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　　Eco-efficiency are prerequisites for the sustainable development of ecotourism and material base; social benefit is the raw power of eco-tourism development; economic benefits were important eco-tourism development and management of tension, which play a leading role. Three main benefits are the i

　　The ecological benefits are precondition and material base of the sustainable development of eco-tour; The social benefit is the primitive motive force of development of eco-tour; The economic benefits are ecological tourism development and important pulling force managed, play a leading role from