“不但...而且...”is used to describe two aspects or features of a thing or a person.

And the part after“而且”is the point that the speaker emphasized. And for the speaker, that part is more important than the another part after“不但” .

Furthermore, “不但......而且......”is always used in the positive condition.

• 她不但漂亮，而且聪明。
• 这件衣服不但漂亮，而且很便宜。
• 他不但会弹钢琴而且会拉小提琴。
• 这件事不但与我有关，而且与你有关。