on the fly
副词 adv.
英文释义
副词 adv.
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While in the air, without having touched the ground.
— Jones caught the ball on the fly.
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Spontaneously or extemporaneously; done as one goes, or during another activity.
— The software program has a table of values for some results, but calculates others on the fly.
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On the move.
— The Owl is flying high, frightening to the eye. The Rattler is nearby, Cool is on the fly. Danger is his business.
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数据来源: Wiktionary