问题描述：
解释下这两个句子为什么要使用括号里的形式.Those who break the law will not escape(being punished).
A few days ago ,(while visiting)the school ,he learned from a group of friends that the teacher would soon be leaving.
A few days ago ,(while visiting)the school ,he learned from a group of friends that the teacher would soon be leaving.
问题解答：
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