As the world's population continues to grow, the supply of food becomes
more and more of a concern. 老师,您好,请问 of+名词=adj.的这种结构中,名词前面不是通常是零冠词吗?如 of importance =
important,可是为什么上面这个句子中是 of a concern 啊?
As soon as the light in the bedroom went out there was a stirring and a liuttering all through the farm buildings.这里的stirring和fluttering并不像painting和swiming那样变成一个真正意义的名词,为什么也要用冠词a,而且它的单复数有什么意义呢?