There are, of course, all sorts of legacy reasons why the front-end design of computer operating systems is so complicated.
当然，所有的遗留问题是为什么电脑操作系统的前端设计是如此的复杂。
The front end is composed of a client computer, or the computer network of an enterprise, and the applications used to access the cloud.
前端由客户机计算机（或企业的计算机网络）和用来访问云的应用程序组成。
The automatic production system is computerized by the central computer and frequency modulation and motor speed change are made by front-end control CARDS.
基于计算机控制的楞纸板自动生产系统，以主控计算机为自动控制核心，通过前端控制卡，实现了对变频器进行调节，和对电动机调速。
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