He said the failure of the city's public utility system is of real concern.

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He said the failure of the city's public utility system is of real concern.

不是跟前面的is一起看,应该是跟后面的concern一起来看的
of + n相当于一个形容词,表达是真的令人担忧的

be of经常用的,意思是:内容,具有....性质

of importance=important of+名词是形容词 of concern=concerned