求翻译：这篇报告主要运用案例研究的形式对公司可持续发展问题进行了讨论。根据YIN所说，当研究的问题是关于why和how以及一些深层次分析social phenomenon works的时候要运用case study research 的方法是什么意思？

The main use of this report in the form of case studies on corporate sustainability issues were discussed .

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This report mainly has carried on the discussion using the case research form to the company sustainable development question.Said according to YIN, when studies the question is about why and how as well as some deep analytic hierarchy social phenomenon works time must utilize case study research th

This report uses case studies on companies in the form of sustainable development issues were discussed. According to YIN said, when the question is about why and how, as well as some deeper analysis of social phenomenon works when using the method of case study research

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