swift·ness /ˈswɪf(t)nəs/
迅速,敏捷
Swift·ness, n. The quality or state of being swift; speed; quickness; celerity; velocity; rapidity; as, the swiftness of a bird; the swiftness of a stream; swiftness of descent in a falling body; swiftness of thought, etc.
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swiftness
n : a rate (usually rapid) at which something happens; "the
project advanced with gratifying speed" [syn: speed, fastness]