对于给定应用程序域，宿主可更改默认的基于角色的安全性策略并设置默认安全主体。

For a given application domain, the host can change the default role-based security policy and set a default security principal.

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程序集对于剪贴板只具有这样的访问权限：粘贴来自同一个应用程序域的内容。从剪贴板进行复制和剪切的功能不受限制。

Assemblies only have access to the Clipboard to paste content from the same application domain. The ability to copy and cut from the Clipboard is unrestricted.

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因此，被引用的对象的元数据必须对于两个应用程序域均可用，以便用JIT正确编译该方法调用。

As such, the metadata for the object being referenced must be available to both application domains to allow the method call to be JIT-compiled properly.

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