数据仓库中的数据不是一成不变的，而是随时间不断变化的。
它也是在随时间社会的变化在不断的改善与进步中。
It is also in the social changes over time in the continuous improvement and progress.
它也是在随时间社会的变化在不断的改善与进步中。
It is also in the social changes over time in the continuous improvement and progress.
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