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1. Oxford American Dictionary

   mainspring

   • IPA[ˈmānˌspriNG]

   美式

   • n.
     something that plays a principal part in motivating or maintaining a movement, process, or activity；the principal spring in a watch, clock, or other mechanism.

   • noun: mainspring, plural noun: mainsprings

2. • 釋義

   n.

   名詞

   • 1. something that plays a principal part in motivating or maintaining a movement, process, or activity innovation is the mainspring of the new economy
   • 2. the principal spring in a watch, clock, or other mechanism.
3. • 更多解釋

   mainspring

   • IPA[ˈmeɪnsprɪŋ]

   英式

   • n.
     the main agent of motivation: innovation is the mainspring of the new economy

   Oxford Dictionary