To ride the clouds and drive the mist (originally describing immortals' travel); to move with extraordinary speed; to be dazed or disoriented.
表演者身轻如燕，在舞台上腾云驾雾般地舞蹈，赢得了观众的热烈掌声。
The performer was as light as a swallow, dancing on the stage as if soaring through clouds and mist, winning warm applause from the audience.
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