You can initially create an abstract buffer with an empty linked list of memory block.

最初可以使用内存块的一个空链表来创建一个抽象缓冲区。

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The UNION operation repeats this step until the SHIP buffer is empty.

UNION操作符重复这个步骤，直到ship缓冲区为空。

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When the SHIP buffer is empty, the SHIP logic sends another 'Fetch' request to the "US" server to get the next block of data.

当ship缓冲区为空时，SHIP逻辑将另一个' Fetch '请求发送到“ US ”服务器，以便获取下一块数据。

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