Mainspring

['meɪnsprɪŋ] or ['mensprɪŋ]

解释:

(noun.) the most important spring in a mechanical device (especially a clock or watch); as it uncoils it drives the mechanism.

琼整理--From WordNet

解释:

(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: The chief or most powerful motive; the efficient cause of action.

校对:拉里

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