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1. Oxford American Dictionary

   pivotal

   • IPA[ˈpivədl]

   美式

   • adj.
     of crucial importance in relation to the development or success of something else；fixed on or as if on a pivot
2. • 釋義

   adj.

   形容詞

   • 1. of crucial importance in relation to the development or success of something else the alliance that played a pivotal role in the revolution
   • ▪ fixed on or as if on a pivot a sliding or pivotal motion