smooth flow of traffic

• 畅通交通

smooth flow of traffic的用法和样例：

例句

1. The police kept the traffic moving.
   警察使交通畅通。
2. The traffic engineer's work then was to keep the traffic flowing, not to design the road.
   当时交通工程师的工作是保持交通畅通，而不是去设计道路。