An impelling force; an impetus.
动力驱使性的力量；
If we expect that life won't be perfect, we'll be able to avoid an impelling force to quit.
如果我们相信生活不可能是完美的。我们就能避免因一时的冲动而放弃追求。
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。
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