意思是：有重大的作用。be of importance = be important. be of great importance = be very important.如：这本书非常重要。This book is very important./ This book is of great importance.今天的知识非常重要。The knowledge today is very important./ The knowledge today is of great importance.
Of +名词 相对于形容词（作表语、定语，注意都是后置），此用法比较小资。记住译成中文的“有”、“具有”、“ 拥有”就差不多了。例如a thoght of value 一个有价值的思想an issue of imporatance 一个具有重要性的问题be of obvious advantage 具有明显优势be of sufficient strongness 具有足够的强度be of insufficient member to do job 缺乏足够的人员去做事.Malignant tumors are of several types 恶性肿瘤有几种类型He is of pensionable age. 他到了（有了）拿养老金的年纪。The boilers are of low-pressure design. 这些锅炉有着低压设计。These products are of high quality. 这些产品拥有高质量。He is of royal blood. 他拥有皇室血统。The congregation is of Croatian descent.这些人群有着克罗地亚血统（有的翻做克罗地亚裔，也对，不过是转义）Recycled stationary may be less white and of a rougher texture.回收的文具可能没那么白净、质地有些粗糙。Both sides think of the point as of no consequence.双方都认为这一点不具有严重性。Marriage today is less of an ego realization and more of an economic bargain for men.今日的婚姻对男人而言，自我实现的含义（有的）少，而经济学意义上的一次交易的含义（有的）多。
黎明前的静谧
