power reserve是什么意思啊

IntroductionPowerreserveisatermusedinthewatchworldtorefertotheamountoftimethatamechanicalwatchcankeeprunningafterithasbeenfullywound.Itisaveryimportantfeatureof…
IntroductionPowerreserveisatermusedinthewatchworldtorefertotheamountoftimethatamechanicalwatchcankeeprunningafterithasbeenfullywound.Itisaveryimportantfeatureof…