Evidently fixed limits exist as regards increase of mass and reduction of retarding force, but the impelling force can be increased indefinitely.
显然，固定的界限只存在于增加质量和减少减速力上，但推动力可以不确定地增加。
As one of the means of visual culture transmission, animated cartoon becomes more and more popular and in the meantime it gradually shows great appeal, affinity and impelling force to the audience.
作为视觉文化传播的手段之一，动画为越来越多的受众所喜爱，显示出了日益强大的吸引力、亲和力和感召力。
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