The AppDomain is the minimum block of code that can be unloaded off the CLR.
应用程序域是CLR下最小代码单元。
At the top level is the ASP.NET runtime which creates an 'Appdomain' which in turn has' HttpRuntime 'with' request ', 'response' and 'context' objects.
最高层是ASP.NET运行时，它已经创建一个应用程序域(AppDomain)，相应地有HttpRuntime包括request、respone、context对象。
Plugs are a convenience feature that allow to switch from HTTP communication to in-memory communication when services are co-located inside the same AppDomain
Plugs是一个很方便的功能，当服务被一起加载到同一个AppDomain的时候，它能够把HTTP通讯转换到内存中的通讯。
Reason 6: Out-of-Process Execution and Runtime Selection NUnit 2.5 extends the AppDomain isolation approach to running tests under one or more separate processes.
原因6：进程外执行和运行时选择。NUnit 2.5扩展了AppDomain的隔离方式，以在一个或多个隔离进程中运行。
A critical region is one where the effects of an asynchronous or unhandled exception might not be limited to the current task, but rather might destabilize the entire AppDomain.
临界区是指在此区域内异步或未处理异常的影响可能不仅局域于当前任务，而且还可能造成整个AppDomain不稳定。
In contrast, with a static field, that field exists in only one memory location (or, more specifically, in only one memory location per AppDomain), regardless of the number of instances.
而相反，对于静态字段，无论有多少实例，该字段只位于一个存储位置(或者，更具体地说，在每个AppDomain中，只位于一个存储位置)。
In contrast, with a static field, that field exists in only one memory location (or, more specifically, in only one memory location per AppDomain), regardless of the number of instances.
而相反，对于静态字段，无论有多少实例，该字段只位于一个存储位置(或者，更具体地说，在每个AppDomain中，只位于一个存储位置)。
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