既是可数名词,也是不可数名词,1.当（某人掌握或使用的）词汇、词汇量讲时,既是可数可数也是不可数2.（某一语言的）词汇、词汇量时,是可数名词3.当表示词汇表的意思时,既是可数名词也是不可数名词一般我们用这个词时,复数 形式用得较少.这些是我在牛津字典查的,应该没错

相关介绍：

A child's vocabulary expands through reading.

孩子的词汇量通过阅读得到扩大。

Reading will enlarge your vocabulary.

阅读能扩大词汇量。

His speech is immature, his vocabulary limited

他说话很幼稚，使用的词汇有限。

Love was a word he'd erased from his vocabulary since Susan's going.

自从苏珊离开后，他再也不提“爱情”这个词了。

Most people have a smaller vocabulary in speech than in writing.

多数人口语的词汇量比书面语少。