城市是一个地点或概念。
The city is not a short phrase. It's an noun, which means city. If you want to make it into a short phrase, you need to add some adjectives or prepositions to it, so that he can become a part of a short phrase. So if there is only one word in the phrase, it cannot be a part of a short phrase as well if it isn't a part of a phrase.
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