By means of the commonly-used domestic variable duration impulse integrated controller, alternative design was carried out on PWM control chip of switching power on overseas equipments.

介绍了利用国内常用的脉宽调制型集成控制器对国外装置上开关电源的PWM控制芯片的替换设计。

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And there is the graver case of children who are faced with the uncompromising reality of the drive for sex, power and respect, without the expertise and impulse control it takes to ward off unwanted pregnancy or violence.

WSJ: What's Wrong With the Teenage Mind?