However, it is a little awkward for constructing and modifying data structures.
然而，构造和修改数据结构有点困难。
Constructing a new logical data model.
构造新的逻辑数据模型。
Before constructing a report, setting up data sources is usually required.
在构建报表之前，我们通常都要建立数据源。
Before constructing a report, setting up data sources is usually required.
在构建报表之前，我们通常都要建立数据源。
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