out of thin air
US /aʊt əv θɪn ɛr/
UK /aʊt əv θɪn ɛr/
1.
凭空, 突然出现
appearing or happening suddenly and unexpectedly, as if from nowhere
:
•
The magician made a rabbit appear out of thin air.
魔术师让一只兔子凭空出现。
•
Ideas don't just come out of thin air; they require effort and thought.
想法不是凭空产生的；它们需要努力和思考。