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。

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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。

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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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