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mainspring n. 主发条;主要原因 主发条;主要原因 mainspring n 1: the most important spring in a mechanical device ( especially a clock or watch); as it uncoils it drives the mechanismmainspring \ main" spring`\, n. The principal or most important spring in a piece of mechanism, especially the moving spring of a watch or clock or the spring in a gunlock which impels the hammer. Hence: ( Fig.) The chief or most powerful motive; the efficient cause of action; as, the mainspring of action. [ 1913 Webster] 38 Moby Thesaurus words for " mainspring": ambition, aspiration, basis, calling, cause, consideration, font, fount, fountain, fountainhead, goal, ground, guiding light, guiding star, headspring, headstream, headwater, ideal, inspiration, intention, lodestar, matter, mine, motive, principle, quarry, reason, riverhead, sake, score, source, spring, springhead, ulterior motive, vocation, well, wellhead, wellspring
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