Extra work in the original systems is minimized and users get transparent access to all the original data resources.
对原始系统的改造极小，且用户可以透明地访问原始系统的所有数据资源。
Extra work in the original systems is minimized and users get transparent access to all the original data resources.
对原始系统的改造极小，且用户可以透明地访问原始系统的所有数据资源。
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