This 'ah' is an interjection used to express surprise.
啊：语气上扬，表示惊讶。
In grammar an interjection is a word or a phrase used to express a strong feeling.
文法中，感叹语是用来表达一种强烈感情的单词或短语。
In grammar, an interjection is a word or a phrase used to express a strong feeling.
文法中，感叹语是用来表达一种强烈感情的一个字或片语。
The second chapter discussed the problem of defining an interjection.
第二章主要讨论有关感叹词的界定问题。
The second chapter discussed the problem of defining an interjection.
第二章主要讨论有关感叹词的界定问题。
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