求翻译：在移动学习资源、实施方式、应用情境以及辅助学习、教学管理等方面的有效性得出了很多有益结论。但是这些层面的研究是因国而异，是什么意思？

In the mobile learning resources, implementation, application scenarios and assisted learning, teaching management, and other aspects of validity draw many useful conclusions. But these levels vary from one country

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In motion aspect and so on study resources, implementation way, application situation as well as assistance study, teaching management validity have drawn very many beneficial conclusions.But but these stratification plane research is because of the country different,

Applications in mobile learning resources, implementation, effectiveness, and supporting learning and teaching management of many useful conclusions were reached. But the level of research is varies from country to country,

正在翻译，请等待...