Structural specialization involves creation of the schema definition, module, and group files.
结构性专门化涉及到创建模式定义、模块和组文件。
RDL allows the definition and application of relations between classes, based on correspondences between structural features.
基于结构化特性之间的通讯，RDL允许类之间的关联的定义和应用。
Western economists focus on their long and also formed various theories of structural unemployment, but since its strict definition are not perfect.
西方经济学家对其早有关注，同时也形成了形形色色的结构性失业理论，而对其严格的定义至今却没有完善。
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