断言安全权限后，安全堆栈审核随即停止。
A security stack walk stops when a security permission is asserted.
而调用远程对象时，则不跨越远程处理边界执行堆栈审核。
When a call is made on a remote object, this stack walk is not performed across the remoting boundary.
不会导致堆栈审核的要求只有 链接要求，这些要求只检查直接调用方。
The only demands that do not result in a stack walk are link demands, which check only the immediate caller.
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