高级词汇在英语中被称为 "advanced vocabulary"。来源主要是通过阅读、学习、和语言交流等多种方式来增加词汇量。

下面是一些英文例句及其中文翻译:

The author's use of obscure vocabulary made the book difficult to understand.
作者使用的生僻词汇使得这本书难以理解。

She had an extensive vocabulary and was able to express herself eloquently.
她有广泛的词汇量，能够雄辩地表达自己。

He had a penchant for using obscure words to impress others.
他有喜欢使用生僻词汇来给别人留下深刻印象的倾向。