求翻译：　　In addition, we can take part in a variety of events in big cities. Human being likes to live together and need to interact with each other. In a big city, the population density is high therefore there are always plenty of social activities, sports events and concerts. There are more recreational places in big cities, such as opera houses, movie theatres, clubs, and swimming pools. You will have many kinds of entertainment in big cities, and meet many people. In countryside, however, the life may be dull and quite, and you may only have a few neighbors. Living alone with few activities can easily cause mental diseases.是什么意思？

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