"积累好词好句" 可以用 "build up a repertoire of good words and phrases" 来表达。
这个短语的来源是基于两个单词：
"repertoire" 是来自法语的一个名词，意思是一组技能、知识或技巧的总和。在这里，它指的是一组好的英语词汇和短语。
"build up" 是一个动词短语，意思是逐渐增加、增强或提高。
所以，"build up a repertoire of good words and phrases" 的意思就是逐渐积累一组好的英语词汇和短语。
例句：
I'm trying to build up a repertoire of good words and phrases to use in my business presentations.
She's been reading a lot of books in Engpsh to build up a repertoire of good words and phrases.
To improve your Engpsh communication skills, it's important to build up a repertoire of good words and phrases.