例句：

The wallet is of importance

1. "(be)+of+名词"结构中的名词是抽象名词时,相当于其中名词所对应的形容词的意思，说明被修饰词具有某种特征或属性。

常用的名词有use/importance/help/value/interest/quality/service/benefit/necessity等。

例如:

I don't want to hear what you are saying. It is of no interest to me.

我不想听你说,我对此不感兴趣。(of no interest=not interesting)

Doing morning exercises will be of benefit to your health.做早操对你的健康有利。

Coal is of great importance to the development of industry.煤对工业发展是相当重要的。(of great importance=very important)

2. "(be)+of +名词"结构中的名词表种类、数量、度量等时,表示不同的人或物的共同特征,此时名词前通常带有冠词。常用的名词有size/kind/type/price/height/depth/width/length/weight/age/shape/colour等。

例如:　　

We are of the same age. 我们同岁。

The twin sisters are of a size and the skirt fits each of them exactly.

双胞胎姐妹的身材一样,这件裙子两个人穿都非常合适。

Machines are of different types and sizes.机器有不同的型号和规格。