允许直接操作（Allow direct manipulation） 2) 建立约束 (Constraints creation) 建立检测到的和基于特征的约束 3） 约束可视（Constraints visualization） a.
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在一个好的操作系统中，不允许单个进程直接访问分配给其它进程的任何内存。
In a good operating system, a single process is not allowed to access any of the memory allocated to other processes directly.
闭包标注取消了与内部类相关的引用，允许更紧凑(重点更突出、更直接)地表示需要的数据操作。
The closures notation strips away the boilerplate associated with inner classes, allowing a more compact (and more importantly, more direct) expression of the desired data operation.
例如，仅仅检索或更新数据的数据服务操作如果没有应用业务逻辑，那么不应该允许直接从Channel services层调用。
For example, data service operations that merely retrieve or update data, without the application of business logic should be permitted to be called directly from the Channel Services layer.
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