A lot of work has been done towards the higher security of information system, and many mature information system prototypes have been developed.
长期以来，人们针对信息系统的安全问题作了大量研究，已经有许多成熟的信息系统安全模型。
A lot of work has been done towards the higher security of information system, and many mature information system prototypes have been developed.
长期以来，人们针对信息系统的安全问题作了大量研究，已经有许多成熟的信息系统安全模型。
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