active congestion

例句：

1. 1. The city's subway system is experiencing activecongestion during rush hour.
   城市的地铁系统在高峰时段正经历着活跃的拥堵。
2. 2. The road was so congested that it took us over an hourto reach our destination.
   那条路非常拥堵，我们花了一个小时才到达目的地。
3. 3. Thetraffic police are actively monitoring the congestion on the highway.
   交通警察正在积极监控高速公路上的拥堵情况。