A mathematic modeling was built before study automatic control system to briefly describe the relation between input and output variables.
在研究自动控制系统之前建立一个数学模型是为了更简捷地描述输出变量与输入变量之间的关系。
As a mathematic tool of modeling natural geometry, fractal theory has been found wide applications in varied fields with great success.
分形理论作为一种描述客观世界的几何工具，在短短的时间内已成功应用于许多学科。
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