已超出该请求线程的限制。

The thread limit for this request was exceeded.

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异步处理允许在每个事件上花更多的时间，而无需占用请求线程。

Asynchronous processing allows more time for each event without tying up the requesting thread.

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为了避免这一点，未捕获处理程序可以决定是请求异常中止调用，还是请求线程退出调用。

To avoid this, an un-caught handler can decide whether to invoke an abort or a thread-exit call.

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