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1. Oxford Dictionary

   rapidity

   • IPA[rəˈpɪdɪti]

   英式

   • n.
     the quality of moving or reacting with great speed；the fact of happening at a great rate; swiftness

   • noun: rapidity

2. • 釋義

   n.

   名詞

   • 1. the quality of moving or reacting with great speed the fish sank into the sand with such rapidity that it must be seen to be believed
   • ▪ the fact of happening at a great rate; swiftness technology spreads with extraordinary rapidity
3. • 更多解釋

   rapidity

   • IPA[rəˈpidədē]

   美式

   • n.
     the quality of moving or reacting with great speed: the fish sink into the sand with such rapidity that it must be seen to be believed

   Oxford American Dictionary