ce·ler·i·ty /səˈlɛrəti/
敏捷,快速
Ce·ler·i·ty n. Rapidity of motion; quickness; swiftness.
Time, with all its celerity, moves slowly to him whose whole employment is to watch its flight. --Johnson.
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celerity
n : a rate that is rapid [syn: quickness, rapidity]