1. The city experienced heavy traffic congestions during rush hour.
这座城市在高峰时间出现了交通拥堵。

2. The congestion at the airport caused many flights to be delayed.
机场的拥堵导致许多航班延误。

3. Cold medicines can help relieve nasal congestions.
感冒药可以帮助缓解鼻塞。

4. The congestion in the subway system made commuting difficult for many people.
地铁系统的拥挤使很多人的通勤变得困难。

5. Public transportation can help reduce congestions on the roads.
公共交通可以帮助减少道路上的拥堵。

6. The congestion in the emergency room was overwhelming due to the flu outbreak.
由于流感爆发，急诊室的拥挤情况十分严重。