DAS是为特定数据源种类处理技术细节的服务。
A DAS is a service that handles the technical details for a particular kind of data source.
该文针对实验室的污染源种类复杂、危害大的特点，提出了一系列的预防措施。
Author assays the bad effect of trash from laboratory and gives a series of prevention measures in the paper.
该文针对实验室的污染源种类复杂、危害大的特点，提出了一系列的预防措施。
The trash from laboratory has done great harm to environment. Author assays the bad effect of trash from laboratory and gives a series of prevention measures in the paper.
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