This paper introduced the hardware and software constitution of the step-motor direct control system with PLC, and expounded the application in the engine control system in bench test.

介绍了运用PLC直接控制步进电机系统的软硬件组成，阐述了PLC直接控制步进电机技术在发动机台架试验测控系统中的应用。

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In order to test the composition of green sand on-line and control its quality, an optimizing direct-control system based on a new method has been developed by the authors.

为了实现型砂质量的快速在线检测和组分控制，本文作者研制了一种基于新方法的型砂质量直接优化控制系统。

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The mayor has no direct control over education, though he could probably take over the system if he wanted to.

ECONOMIST: Detroit

Well, if Europe has a major recession, and the financial system in Europe starts spinning out of control, that will have a direct impact on U.S. growth and our ability to create jobs and people raising their living standards.

WHITEHOUSE: President Obama Holds a Press Conference at the APEC Summit

By comparison, Apple and RIM offer direct control over the devices that implement their operating systems and have measures to detect and disable attempts to modify the operating system.

FORBES: An Apple Win Deals Another Blow to RIM's Blackberry