The work is unrelated to the Bill & Melinda Gates Foundation he co-founded in 2000, which focuses on building the resilience of poor farmers through promoting better seeds and agricultural practices to help them fend off the negative impact of climate change.
The grottoes, sometimes called the Caves of the Thousand Buddhas, are a system of 500 temples southeast of Dunhuang, an oasis at a religious and cultural crossroads of the ancient Silk Road.
Their experiment went on for five years before the couple established another such community in a village in East China's Fujian province.
Their efforts are more aggressive than those of foreign companies, given that Chinese companies roll out far more new handsets a year, giving them more room to experiment with new features, Yan added.
There are currently around 100 Chinese companies in Switzerland. There's also a growing interest from Chinese investor for Swiss brands in terms of M&A, targeting commodities but also sports, media and technologies, such as the deals between ChemChina and Syngenta, between Dalian Wanda and Infront Sports & Media.
The year 2017 marks the 80th anniversary of the Nanjing Massacre, in which more than 300,000 Chinese were brutally murdered by Japanese invaders when they occupied Nanjing on Dec 13, 1937, marking the start of six weeks of destruction, pillage, rape and slaughter in Nanjing.
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The yuan now trades at about 7-to-1 against the dollar. That's in line with China's economic fundamentals, and the IMF is therefore unlikely to impose sanctions on Beijing, according to Gary Hufbauer, a senior fellow at the Peterson Institute for International Economics in Washington.
Their story is becoming increasingly common in a country where a lack of resources and caregivers means the burden falls increasingly on spouses and children.
Themed "In the Wine Capital We Embrace the Purple Dream", the expo is co-organized by the Ministry of Agriculture and Rural Affairs and the Ningxia government and attracted 500 guests.
Their positive attitude was built on growth of the sector in 2016, when the number of convenience stores rose 9 percent and their combined sales rose 13 percent.