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In the Microsoft Envisioning Center, the first couple watched the demonstration of a series of high-tech products, including Microsoft HoloLens, a world-leading holographic computer; a real-time meteorological data visualization system; and ecosystem hardware made by Chinese engineers using Microsoft technology.

Zhou Hong, a scholar with the Chinese Academy of Social Sciences, thinks that Xi's trip, during which he visits a single European nation, is very rare in China-Europe ties, and that it in some way indicates China attaches great importance to its relations with Britain, which is a major country at the core of the European Union.

Recent years have witnessed more and more informal meetings between Chinese and world leaders, which experts say is a pioneering move of Chinese diplomacy and offered opportunities for in-depth conversations between the leaders in an easier way.

The policy was later relaxed to say that any parents could have a second child if they were both only children.

"So it has a benefit internationally. I think it was important for the U.S. to adjust its position with respect to Chinese role in the international financial institutions and in international aid assistance," he said.