The traffic jams during morning and afternoon rush hours are a headache in big cities now.
The traffic jams during morning and afternoon rush hours are a headache in big cities now.
正确答案：上下班高峰期的交通拥挤问题是大城市目前的一个棘手问题。
The traffic jams during morning and afternoon rush hours are a headache in big cities now.
正确答案：上下班高峰期的交通拥挤问题是大城市目前的一个棘手问题。
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