While big cities are attracting more and more people, they also bring many challenges, such as traffic jam and pollution.

虽然大城市吸引了越来越多的人，但也带来了许多挑战，如交通堵塞和污染问题。

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As much as they give flexibility and service, they are also the reason for many accidents and the permanent traffic jam.

它们带来了便利和服务，同样也是造成许多交通事故以及永远拥堵的原因。

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Cities provide convenience and civilized lifestyle, but they also bring about a series of problems, such as pollution, traffic jam, and crime, etc.

城市给人们带来了便利和文明的生活方式，同时也带来了一系列问题，如污染、交通堵塞、犯罪等。

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