Déyǔ de guàncí yào suízhe míngcí de xìng hé gé biànhuà.
In German, the article changes with the noun's gender and case.
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冠 here means "to cap, to put on top": the article sits in front of the noun like a hat. English has a 定冠词 "definite article" (the) and 不定冠词 "indefinite article" (a, an). The rarer synonym is 冠形词.