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