traffic是可数名词还是不可数名词

　　Traffic双语例句：

　　We should do something about the traffic problem.

　　我们应当对交通问题进行整顿。

　　There was heavytrafficon theroads

　　道路上车流拥挤。

　　Air traffic had returned to normal.

　　空中交通已恢复正常。

　　Traffic is now flowing smoothly again.

　　现在，交通又畅通了。