在这个例子中的屏蔽使用Optim内部的一个简单函数(substring)，但是仅当这些文件带有关系表时才可以使用完整的屏蔽功能。
The masking in this case is using one of the simpler functions within Optim (substring), but the entire set of masking functionality is available for these files just as it is with relational tables.
在这个例子中的屏蔽使用Optim内部的一个简单函数(substring)，但是仅当这些文件带有关系表时才可以使用完整的屏蔽功能。
The masking in this case is using one of the simpler functions within Optim (substring), but the entire set of masking functionality is available for these files just as it is with relational tables.
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