I have no willpower.我没有意志力。

I know I've got the willpower to do it.我知道我有做这件事的毅力。

His attempts to stop smoking by willpower alone failed.他多次想单凭意志力戒烟都没有成功。

It took a real effort of willpower to get out of bed the next morning.第二天早晨全凭意志力才从床上爬起来。

a device which lets people control machines using just willpower让人仅靠意念控制机器的装置