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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You want to fill the empty buffer space with a specific character.

以某个特定字符填充空闲缓冲区。

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When the buffer is empty, the transport layer is responsible for refilling it.

当缓冲空了，传送层负责再装满它。

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When the buffer is empty, the transport layer is responsible for refilling it.

当缓冲空了，传送层负责再装满它。

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