This makes it highly efficient but means that client notification of events is delayed until the client makes an unrelated call.
这使它具有较高的效率，但也意味着客户机事件通知被延迟到直到发生另一个不相关的客户机调用。
If you wanted the queued item to do something else, you would need to add that to the implementation of the Delayed object and call that new method upon retrieval from the queue.
如果希望队列项做一些其他事情，就需要在Delayed对象的实现中加入方法，并在从队列中取出后调用这个新方法。
ANNE: Call the airline and see if the flight is delayed. If it's on time, try and find an alternative flight.
打电话给机场看能不能延误起飞。如果要准时起飞的话，那就试着找其他航班。
ANNE: Call the airline and see if the flight is delayed. If it's on time, try and find an alternative flight.
打电话给机场看能不能延误起飞。如果要准时起飞的话，那就试着找其他航班。
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