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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
mechanism

mainspring \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]


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