The producer adding an element to the queue will wait for a consumer in another thread.

在队列中加入一个元素的生产者会等待另一个线程的消费者。

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While the queue is unbound in size, enabling adds to return immediately, one cannot take an element from the queue until the delay time has expired.

因为队列的大小没有界限，使得添加可以立即返回，但是在延迟时间过去之前，不能从队列中取出元素。

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When that consumer is available, the element is passed directly between consumer and producer, never literally getting added to the blocking queue.

当这个消费者出现时，这个元素就直接在消费者和生产者之间传递，永远不会加入到阻塞队列中。

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