它包含强制服务器执行大量的普通任务，到达服务器的能力极限。
It involves getting the server to perform a large number of mundane tasks, exceeding the capacity of the server to cope with any other task.
后面这种方式会强制服务器提供 UI 元素（这一过程本身可能就是一个危险的事情）。
The latter method forces the server to provide the UI elements (which might in itself be a dangerous proposition).
最后要做的一件事，就是激活poa，使客户机请求开始排队，并强制服务器输入其事件循环，以接收这些传入的请求。
The last thing we need to do is activate our POA to start queuing client requests and force the server to enter its event loop to receive those incoming requests.
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