but作排比的使用方法

Her style was clear but lively, informative but not preachy, and for most readers truly exhilarating. Although the oceans may cover seven-tenths of the earths surface, few of us know much about them.

1、but做排比使用方法时，是什么词性，的意思是？

2、and for most readers truly exhilarating是介词短语做状语吗？干什么种类的状语？

Her style was clear but lively, informative but not preachy, and for most readers truly exhilarating.

【翻译】她的风格明确而活泼，内容丰富但不说教，对大部分读者来讲确实让人耳目一新。

but 是转折并列连词，没错。语言的精髓在于“简练”。重复累赘的词汇是语言表达的大忌。任何语言都有“承前省略”现象。比如，本句假如不省略的话，就会是这个样子：

Her style was clear but it was lively, her style was informative but it was not preachy, and for most readers her style was truly exhilarating.

红色部分即是省略的成分。