光盘存储设备的伺服系统是精密机械和计算机控制的结合，集合了激光测量及定位跟踪、DSP应用等高新技术。
Servo system of the compact disc storage device is the combination of fine machine and computer control, gathering high tech such as laser measure or tracking position and DSP application.
从两个方面讨论了模糊集合的语义，通过随机集合理论和等高线函数对模糊概念进行了说明，利用等价关系理论对模糊环境进行说明，同时结合一些具体实例加以详细讨论。
The vague concept is explained by the random set and the contour function, and vague environments are explained with equality relation. Moreover, several examples are presented in the paper.
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