we use a or an before nouns when we mention them for the fir

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we use a or an before nouns when we mention them for the first time.
We use the when we mention them again.
we use the before nouns whenit is clear what we are talking about.
For example,atthe airport,Judy and Miss Lu have this conversation.
we often use the before things and people when there is only one of them.
它们的翻译是什麽?

当我们第一次提到某事物时要在名词前加上a或者an
再次提到该物时用the,
在我们明确所谈到的事物时名词前用the,
例如：在机场,朱迪和鲁小姐说了这段话.
我们通常在具有唯一性的人或物前用the.

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