They study computer systems, telecommunications, information security, budgeting, and more.
他们学习计算机系统，电信，信息安全，预算等。
Before 1970, in order to protect the information security in computer systems, mandatory and discretionary access control policy had been widely applied in secure computer systems.
在上世纪七十年代以前，为保证计算机系统中的信息安全性，自主存取控制和强制存取控制策略在计算机多安全级系统中得到了广泛的应用。
Before 1970, in order to protect the information security in computer systems, mandatory and discretionary access control policy had been widely applied in secure computer systems.
在上世纪七十年代以前，为保证计算机系统中的信息安全性，自主存取控制和强制存取控制策略在计算机多安全级系统中得到了广泛的应用。
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