Final answer:
Gerunds are -ing verb forms used as nouns. In the sentence provided, 'engineering' is a gerund functioning as an appositive noun.
Explanation:
Gerunds are the -ing form of a verb that can function as nouns in sentences. In the sentence 'Our field, engineering, has made great advances in fire safety,' the gerund 'engineering' functions as an appositive noun renaming 'field.'
Learn more about Gerunds in sentences here:
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