由于分布式多层应用系统均在网络环境下运行，所以，它的执行效率成为设计时不可忽视的重点。
Because of the running of distributed-tier MIS based on net environment, so should pay more attention to the efficiency when design this system.
由于分布式多层应用系统其自身的结构特征及其运行环境，决定了它的执行效率将成为其设计中不可忽视的重点。
Because of the running of distributed-tier MIS based on net environment and its architecture so people should pay more attention on the efficiency when people design this system.
分布式多层结构是应用系统开发不可避免的趋势，而计算机及其网络的安全问题又是一个极其重大的问题。
To develop the distributed multiplayer structure is a must for the application system and the security of computer and network is a big problem.
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