英汉词典

1. （某人所掌握的）词汇,词汇量
    Your vocabulary is the total number of words you know in a particular language.

    e.g. His speech is immature, his vocabulary limited...
           他说话很幼稚，使用的词汇有限。
    e.g. We read to improve our vocabularies.
           我们阅读以便扩大词汇量。

2. (某一语言的）词汇，词汇量
    The vocabulary of a language is all the words in it.

    e.g. ...a new word in the German vocabulary.
           德语词汇中的一个新词

3. 专业词汇
    The vocabulary of a subject is the group of words that are typically used when discussing it.

    e.g. ...the vocabulary of natural science.
           自然科学词汇