• 1. large special events: 大型活动
• 2. Other Large Special Events: 等大型专题活动
• 3. large-scale special events: 大型活动

• 1.How to ensure traffic unblocked and reduce the impact on normal traffic during large special events is a difficult problem to traffic managers.
  如何保证大型活动期间交通畅通、减少对城市交通系统的影响，是摆在交通规划管理者面前一个亟待解决的难题。
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