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While problems are inevitable, there are needs for new negotiations and invitations to more economies to join in the process, he added.

China hopes to work together with Norway to open a new chapter in bilateral ties, and push forward a sustained, healthy and stable relationship, Li said.

For instance, a running exercise device -- crucial for long-term space lab missions -- was tested and will help guide future research and development.

"The book shows a clear way how China's friends could be integrated with China's amazing development, reform and modernization. It analyses factors and relationships that promote national capability and the challenges the state leadership face and must accept in today's world", Dr Upendra Gautam, General Secretary at China study Center told Xinhua.

In the letter, Xi said that thanks to joint efforts, the Paris Agreement became one of the fastest international accords in history to enter into force.