With the analysis of Legal Report from engagement subsystem of appraisal system, the reason of its success owes much to the speakers' large adoption of monogloss and heterogloss: expansion.

在评价理论指导下，对普法经典栏目《今日说法》从介入子系统的角度展开分析研究，可以得知该节目成功的原因在于单声与扩展性多声介入的大量成功使用。

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