ra·pid·i·ty /rəˈpɪdəti, ræ-/
迅速,急速,速度
Ra·pid·i·ty n. The quality or state of being rapid; swiftness; celerity; velocity; as, the rapidity of a current; rapidity of speech; rapidity of growth or improvement.
Syn: -- Rapidness; haste; speed; celerity; velocity; swiftness; fleetness; quickness; agility.
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rapidity
n : a rate that is rapid [syn: celerity, quickness]