A1 used instead of "a" when the following word begins with a vowel sound(用于以元音开头的词前,代替 a)
More examples
He applied to become an American citizen.
Chris has an evening job as an office cleaner.
That was an excellent meal!
There's been an accident - dial 999 and ask for an ambulance.
Let the fish cook for half an hour before you add the wine.
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