n.阻塞；拥挤；充血
Congestion frequently reduces traffic to walking pace. 交通阻塞经常把车流的速度降低得如步行一般缓慢。
The route was designed to relieve traffic congestion. 这条路是为缓解交通拥挤而开辟的。
Nose drops often relieve nasal congestion. 滴鼻剂常可缓解鼻腔充血。
I'm afraid there is a congestion in your left arm. 恐怕你的左臂上有一些淤血。
