1. knowledge，在我们的心里根深蒂固就是一个不可数名词，没错。
表泛指时不用冠词；表程度时，可用 a little, some, much 等修饰，但不可用a few, many 等修饰，更不能用复数形式。如：
Knowledge is power. 知识就是力量。
He has much knowledge of music. 他很懂音乐知识。
The door to knowledge is study. 通向知识的大门是学习。
A little knowledge is a dangerous thing. 一知半解是很危险的事。
You’ll find English is a bridge to so much knowledge. 你会发现英语是通向如此丰富知识的桥梁。
2.在表达“某某知识”时，使用通常要用 the knowledge of/about结构：
He is interested in the knowledge of chemistry.
他对化学知识很感兴趣。
My knowledge of English is very poor.
我的英语知识很贫乏。
His knowledge of physics is pretty basic.
他的物理知识相当浮浅。
practical/medical/scientific knowledge
实际 / 医学 / 科学知识
3.常见搭配：
increase knowledge 增加知识
extend knowledge 扩大知识量
improve knowledge 提高知识
enrich knowledge 丰富知识
widen/broaden knowledge 拓宽知识
get, gain, obtain, acquire, absorb knowledge学习知识
Clever children absorb knowledge easily.
聪明孩子容易吸收知识。
Step by step we gain knowledge.
我们一步一步地获取知识。
After several years’ self-study he gained a lot of knowledge.
经过几年的自学，他学到了不少知识。
以下带介词的表达也类似地表达“学习”：
He’s eager for [after] knowledge. 他求知心切。
He’s eager for [after] knowledge.
He has a hunger for [after] knowledge. 他有强烈的求知欲。
4.貌视可数名词与不定冠词连用
非常有趣的是，knowledge 虽为不可数名词，但有时可在其前用不定冠词，以表示某人有某种程度的知识，此时的不定冠词相当于some。如：
He has a knowledge of history. 他懂点历史。
A knowledge of English is very important. 会点英语是非常重要的。
We’re looking for someone with a good knowledge of German. 我们正在找一个精通德语的人。
She has a wide knowledge of painting and music.
她在绘画和音乐方面知识渊博。
The course seems to presume some previous knowledge of the subject.
这门课程似乎是以具备某些基础知识为前提的。
She has acquired a good knowledge of English.
她英语已经学得很好。
For this job you will need a good knowledge of both Italian and Spanish.
担任这项工作需要精通意大利语和西班牙语。
She has an encyclopedic knowledge of natural history.
她具有广博的自然史知识。
以上5例句摘自《牛津高阶英汉双解词典》
Father had no more than a superficial knowledge of music.
父亲对音乐只懂一点皮毛。
He had a real knowledge of animals, birds and flowers.
他在花鸟走兽方面知之甚多。
This book was designed in order to provide a working knowledge of finance and accounts 本书旨在提供金融和会计方面的实用知识。
He did have a real knowledge of the country
他对该国的确知之甚多。
以上4例摘自《柯林斯高阶英汉双解学习词典》
She has a passable knowledge of English.
她英语（知识）方面还可以。
再做下面的试题也就有了杀鸡用牛刀的感觉啦：
— I find it very difficult to read ____ novel you lent me last week.
— Yes. It’s necessary 知识的英文可数吗 to have _____ good knowledge of history.
A. the; 不填 B. a; 不填 C. the; aD. a; a
【分析】
考生可能以为第一个空是特指对方上周所借给“我”的小说，故应填定冠词;第二个空后面是抽象名词，为不可数名词，不填冠词，于是错选A。然而，此处knowledge之前须用不定冠词表示某人有一定程度的知识，have a good knowledge of意为“对……很了解”在……方面有较好的知识储备“，是固定搭配，故正确答案选C
