knowledge是否可數(shù)及用法

　　例句：

　　1、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。

　　2、 He has a wide knowledge of painting and music.

　　他在繪畫和音樂方面知識淵博。

　　3、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。

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

　　據(jù)我所知，他從未立過遺囑。