Research methods in this article from the perspective of the last century since the 90's, these four areas of research related Commentary.
本文从研究方法的视角，对上世纪90年代以来，这四个领域内的相关研究进行述评。
Siemens' cooperation with Tsinghua University can be dated back to early 1990's and was further extended to research projects in the areas of energy, industry and healthcare.
西门子与清华大学的合作最早可追溯到上世纪90年代早期，并且在能源、工业及医疗等领域进一步加强了研究项目。
Siemens' cooperation with Tsinghua University can be dated back to early 1990's and was further extended to research projects in the areas of energy, industry and healthcare.
西门子与清华大学的合作最早可追溯到上世纪90年代早期，并且在能源、工业及医疗等领域进一步加强了研究项目。
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