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to wing it 即兴发挥（俚语）
英文释义
To do something without any planning or preparation.
例句
Usually I prepare for a speech carefully, but yesterday I was asked to speak at the conference without any warning, so I had to wing it.
我通常很认真地准备演讲，但昨天有人突然请我在会议上讲话，我只好即兴发挥。
