该模式用于禁止模型元素之间的循环依赖（举例来说，不存在从对象到其本身的连接）。
This pattern is used to forbid cyclic dependencies between model elements (for example, there is no link from one object to itself).
该应用程序识别所有连接的US B驱动器，并禁止所有未指定到白名单部分闪存驱动器。
The application recognizes all the connected USB drives and disables all the flash drives that are not specified into the Whitelist section.
该应用程序识别所有连接的US B驱动器，并禁止所有未指定到白名单部分闪存驱动器。
The application recognizes all the connected USB drives and disables all the flash drives that are not specified into the Whitelist section.
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