traffic是

traffic是 交通规则是traffic rule还是traffic rules? 交通警察是TRAFFIC POLICE traffic a traffic jam的traffic是形容词吗?若是为何traffic字典无形容词意思 the traffic police是单数还是复数 the traffic lights的意思是? traffic traffic light traffic rule the traffic was heavy.heavy为什么不能是busy the traffic is very 【 】in rush hours.首字母是h 这个traffic是交易还是交通的意思? The traffic is busy 交通是拥挤的