City traffic problems have troubled most industrially developed countries since the commencement of the 20th century.

城市交通问题是本世纪以来，工业发达国家一直为之困扰的问题。

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But of the 12 countries considered least at risk, including Britain, all but one are industrially developed.

而12个估计受威胁最小的国家，包括英国，除了一个之外均为发达国家。

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