He chuckled at the child's mischievousness.

他对这个小孩的调皮捣蛋低声轻笑。

Very neat in appearance, he had that happy-to-be-alive attitude that made even his occasional mischievousness delightful.

他外表干洁净净，是个乐天派，所以即使是他偶然的淘气捣蛋，也依然讨人喜欢。