Through cyclic pulse distributor and power amplifier, the pulses drive step-motor and let the speed of step-motor in agreement with a required sine function.

经脉冲分配器和功率放大后控制步进电机，使步进电机的转速符合所要求的正弦曲线。

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One critical step that could help to drive change would be to require Ph.D. students and postdoctoral scientists to follow an individual development plan.

一个有助于推动变革的关键步骤是要求博士学生和博士后科学家遵循一个个人发展计划。

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The final step came when steam was introduced into the cylinder to drive the piston backward as well as forward, thereby increasing the speed of the engine and cutting its fuel consumption.

最后一步是将蒸汽引入气缸，使得活塞前后推动，从而提高了发动机的速度，降低了燃料消耗。

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President Umaru Yar'Adua has come under pressure to step up his anti-graft drive in one of the world's most tainted countries since he came to power in 2007.

VOA: standard.2009.04.18

To step forward and drive my own negotiations, as an adult woman, was both a liberating and intimidating experience.

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Or perhaps take it a step further and drive the online service, a threat to the traditional cable business, right into the ground?

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We also need more family members who choose not to be drive-by parents, but step up when necessary.

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