a lot of knowledge可數嗎

　　例句：

　　A measure of technical knowledge is desirable in this job.

　　做這項工作最好多懂一些技術知識。

　　He has a wide knowledge of painting and music.

　　他在繪畫和音樂方面知識淵博。

　　There is a lack of knowledge about the tax system.

　　大家對稅制缺乏了解。

　　For years we had little knowledge of what life was like inside China.

　　以往很多年我們對于中國國內的生活情況所知甚少。

　　He never made a will, to the best of my knowledge.

　　據我所知，他從未立過遺囑。