an

an
determiner

the form of the indefinite article (见 a)used before words beginning with a vowel sound. (见 a)
不定冠词（用于以元音为首的词前）

用法

There is still some divergence of opinion over the form of the indefinite article to use preceding certain words beginning with h- when the first syllable is unstressed: ‘ a historical document’ or ‘ an historical document’; ‘ a hotel’ or ‘ an hotel’. The form depends on whether the initial h is sounded or not: an was common in the 18th and 19th centuries, because the initial h was commonly not pronounced for these words. In standard modern English the norm is for the h to be pronounced in words like hotel and historical, and therefore the indefinite article a is used; however, the older form, with the silent h and the indefinite article an, is still encountered, especially among older speakers

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