| 分層結構的原則：the dependencies between subsystems are from the top down: layers pictured near the top depend on lower layers, but subsystems nearer the bottom do not depend on higher layers. 這種子系統之間的依賴(lài)性只能是從上到下，也就是圖中top的子系統依賴(lài)bottom的子系統，反之則不行。 可以加QQ交流下2685896890 |
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