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Another local legacy Chinese restaurant, Su Hong, which had served generations of families in Palo Alto and Menlo Park since the 1970s, has recently closed after the owner decided to retire.

Apart from putting robots on towers, Insight Robotics also provides drones installed with sensors to help spot fires in remote areas. The drones collect and analyze data, enabling managers to determine the species of trees in the forest and their growing conditions.

Another four people on the hill were unable to call for help because they couldn't get a cellphone signal.

Anna Ekeledo, executive director of AfriLabs, a Pan-African network of over 80 innovation centers across 27 African countries, said there are many opportunities for African countries to work with China on building e-commerce and the digital economy generally.

Ant said the Alipay mobile app handled 118 trillion yuan worth of transactions in the Chinese mainland in the first half, in the year to June, while international transactions stood at 622 billion yuan. Some 80 million businesses have adopted the service till date, for which Alipay charges a fee, it said.