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。

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

youdao

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。

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

youdao