一旦线程被阻塞，所有事件都不能被分发，包括屏幕绘图事件。
When the thread is blocked, no events can be dispatched, including drawing events.
主线程非常重要，因为它负责把事件分发给相应的用户界面widget——包括屏幕绘图事件。
This thread is very important because it is in charge of dispatching events to the appropriate user interface widgets, including drawing events.
在多线程分发模型中，从队列中获取事件的线程启动另一个被称作任务线程的线程，并把事件交给它处理。
In multiple-threaded dispatching model, the thread fetching the events from the queue launches another thread called task thread, and hand the event over to it for processing.
事件分发遵循两种不同的模型。单线程分发模型和多线程分发模型。
Dispatching events can follow two different models. One is called single-threaded dispatching model and the other multiple-threaded dispatching model.
多线程分发很容易产生同步问题，它产生多个可能互相干扰的事件处理线程。
Multiple-threaded dispatching can easily raise synchronization issues. It generates multiple event processing threads, which might interfere with each other.
多线程分发很容易产生同步问题，它产生多个可能互相干扰的事件处理线程。
Multiple-threaded dispatching can easily raise synchronization issues. It generates multiple event processing threads, which might interfere with each other.
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