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为什么要用dll文件来开发公式？ 1.为了突破分析家和飞狐现有功能的限制。 2.为了提高公式速度。 3.为了加密公式的理念。 4.增加新的功能。(Why use DLL files to develop formulas? 1., in order to break the limitations of the existing functions of analysts and flying fox. 2. in order to improve the formula speed