The research in the issuing scope of national debts cannot do without mathematics thinking modes and mathematics methods, such as qualitative analysis and quantitative analysis.
国债发行规模的研究离不开数学思维方式和数学方法，如定性分析与定量分析；
But solving model problem can not be done without mathematics.
解决模型问题又往往离不开数学语言。
But solving model problem can not be done without mathematics.
解决模型问题又往往离不开数学语言。
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