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In this section , we first look at the information technology ( IT ) industry and the systems integration work in the enterprise environment and consider the challenge of incorporating this technology into online games . To teach our students to do these things , we first teach them the basic frameworks and techniques that we use in our own research , because in the future they will have the job of doing their own research and analysis . To initialize the disk , we first write enough blocks sequentially to fill the disk to the desired utilization . When garbage collection is needed , we first choose candidate segments for both traditional cleaning and hole-plugging .