Using PWM to drive motor, and we design a circuit in DC serve control system.

利用PWM驱动方式控制电机的转动，并设计出了直流伺服控制系统硬件电路图。

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Third, primary groups are fundamental because they serve as powerful instruments for social control.

第三，初级群体是基础，因为他们是社会控制的有力工具。

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His research can serve as a valuable reference for the UN to control the spread of EBOLA, a deadly virus.

他的实验能够为联合国提供宝贵的参考，帮助控制埃博拉这一致命病毒的传播。

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Among these, Brazil is exceptional in that many of its dams also serve to control river levels and provide irrigation, thus making them hard to regulate satisfactorily if privatised.

ECONOMIST: Brazil's energy crisis

Not only that, the system that they work within is designed to serve those that control it, albeit foolishly.

FORBES: The Unintended Consequences Of The Greatest Economic Experiment

Evil is epitomized by these greedy and selfish forces that must be brought under control to serve common interests.

FORBES: What Kind of Power Is the Most Dangerous?