The queue when no element, called the empty queue.
队列中没有元素时，称为空队列。
Like many queue algorithms, an empty queue consists of a single dummy node.
像许多队列算法一样，空队列只包含一个假节点。
If there is a slight skewing favoring an empty queue over a full one, the pipe will rarely fill and the reader will more often receive fresh Numbers.
如果有轻微的扭曲支持一个空的队列满的，管道将很少填补和读者经常会收到新的号码。
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