讲解文本：

act up 胡闹，调皮，捣蛋
Don't take any notice of the boy. If you scold him, he'll only start acting up.
不要理那孩子， 你要是责骂他，他反倒会开始调皮捣蛋。
The children have been acting up all evening.
整个晚上孩子们都在调皮捣蛋。

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