递进式结构
1.Fresh vegetables are nutrious; furthermore, they are cheaper than frozen ones.
2.We will not only bring joy into other people’s lives,but also added happiness into our own.
3.But teaching offers something besides money and power:it offers love. Not only the love of learning and of books and ideas ,but also the love that teacher feels for his students来源：恒星英语
4.They do not seem to like one another very much. Neither are they too keen on conventional people.(正统的人)