早期计算机运算速度低，对当时的科学计算和数据处理影响还不大，不能适应机床实时控制的要求。

Early computer operation speed is low, the time for scientific computing, and data processing impact is not quite, can not adapt to the requirements of real-time control machine tools.

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早期计算机的运算速度低，对当时的科学计算和数据处理影响还不大，但不能适应机床实时控制的要求。

Early computer's computational speed low and the prevailing scientific computing and data processing is not affected, but can not meet the requirements of real-time control machine.

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DNC计算机是将指令数据发送到许多机床上去或从许多机床上手机数据，而CNC计算机每次指控制一台或几台机床。

DNC computers distribute instructional data to, and collect data from, a large number of machines. CNC computers control only one machine, or a small number of machines.

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