The main role of economic system is to reduce information cost and coordinate cost of transaction.

经济制度的主要作用是降低交易行为的信息成本和协调成本。

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In the B-mode sector scan ultrasonic imaging system, the raw image is in polar coordinates, therefore, it is main tasks of image pre-processing to achieve image coordinate transform and interpolation.

在B型超声机械扇形扫描成像当中，原始图像信号是以极坐标的形式输出的，对图像进行实时坐标变换和漏点插补是图像预处理所要解决的主要问题。

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