同时，专注于不同层次的抽象概念。 算法接近于计算机科学的应用的边缘，人们期望它运行在真实的系统。
Focus on thinking simultaneously at different levels of abstraction.Closer to the applied end of computer science, algorithms are expected to run on real systems.
MDSD是一种管理软件深层次系统复杂性的方法，不管它们是飞机，卫星，IT网络，还是复杂的应用软件。
MDSD is a method for managing the complexity of software-intensive systems, whether they be aircraft, satellites, it networks, or complex software applications.
应用了系统层次的范围规则，在线定单系统就作为黑盒子中心的演员。
Applying the scoping rules for the system level, the online order system serves as the black box central actor.
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