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This method constructs a semantic tree for 3D models firstly.
该方法首先为三维模型构造语义树；
An algorithm for logic function minimization called semantic tree is reported in the paper.
提出了一种逻辑函数化简语义树算法。
Lexic analysis constructs query semantic tree according to the semantic unit which lexic analyzer provides.
语法分析根据词法分析器提供的语法单元构造查询的语法树。
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