agility [ə'dʒɪlətɪ]

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n.敏捷，活泼

the gracefulness of a person or animal that is quick and nimble

The boy came upstairs with agility. 那男孩敏捷地走上楼来。
His intellect and mental agility have never been in doubt. 他的才智和机敏从未受到怀疑。