flow和traffic的区别？traffic

flow是活动的意思，而traffic则是交通的意思，区别能够从以下例子看出：

What is happening to tonight traffic, there are so many vehicles on the road, and the flow is very slow, 5 minutes distance take 30 minutes. 今晚交通怎么了，路上车多，车流很慢，5分钟旅程要30分钟。