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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。
youdao
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The following is an example of the buffer operation.
下面是一个缓冲区操作的实例。
youdao
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The following is an example of the buffer operation.
下面是一个缓冲区操作的实例。
youdao