(1) The previous sentence "ancient and modern book collections" refers to Tianyi Pavilion in a narrow sense, while it implies that Ningbo has a long history and rich culture, and is a city of book culture with a history of 7,000 years. The latter sentence "Hong Kong connects with the world" highlights the characteristics of Ningbo as a modern international port city. A "book" and a "port" have both spiritual and material meanings, which set off each other and complement each other.

(2) "omitted"

(3) "omitted"