It is heavy traffic和It is a heavy traffic哪一个对

问题描述:

It is heavy traffic和It is a heavy traffic哪一个对

traffic n.[u]不可数名词 前不可加定冠词a
所以 第二个对
多说一句 经常见的是 The traffic is (very,so,...) heavy( or busy).就是It is a heavy traffic对?