求翻译：20世纪以来，城市人口的多少被认为是城市繁荣和经济发展的最重要标志之一。但是，城市人口的增加却带来了许多问题，其中还有很多是人类在城市发展的初期并没有预料到的。是什么意思？

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Ever since the beginning of the 20th century, the city population is considered a number of urban prosperity and economic development of the most important landmark. However, an increase in the urban population has brought a lot of questions, of which there are many cities in the early stage of the

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Since the 20th century, much of the urban population is considered to be one of the most important sign of prosperity and economic development of the city. However, the urban population increase has brought a lot of problems, of which there are many humans in the early stage of urban development and

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