钟表机构中通过松开而驱动机构的发条。
主要动力；[法] 主要动机
钟表机构中通过松开而驱动机构的发条。
The principal spring of a clockwork mechanism, which drives it by uncoiling.
某事最重要的动力或因素。
The most important reason for, or element of, something.
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