GDD包括广泛多样的场景，其中，与软件和系统开发项目有关的人员被扩展至超越常规的单一建筑物或校园环境。
GDD embraces a wide variety of scenarios in which the personnel involved in a software or systems development project are extended beyond the traditional setting of a single building or campus.
据知情人士讲，总共50层的建筑物约有24层空无一人，其中包括最高的三层。
Some 24 of the building's 50 floors are vacant, including the top three, according to people familiar with the building.
据目击者说，上千名民众，其中包括许多中学生，他们包围了建筑物并开始发起攻击。
Thousands of people, including many middle school students, converged around the buildings and began attacking them, they said.
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