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Last February, US President Donald Trump signed an executive order that laid out plans for "maintaining American leadership in AI", and associated the development of AI with the country's national security.

Last month, Watson, who studies communication at a Beijing university, was on a long-haul flight from London to Beijing. She slept through the journey, only to find later she could not move her right arm and fingers.

Last year, a mudslide wiped out a stretch of mountain trail. The volunteers worked hundreds of hours to repair the trail, with a donation of 300 tons of rock from a local company.

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Last year, 160,000 apps were reviewed by officers with industry and information technology departments nationwide, and 191 were removed from online app stores. Thirty-nine app operators were ordered to halt excessive or illegal data collection practices, according to the Ministry of Industry and Information Technology.

Last year, it was ranked 194th on the Global Fortune 500 list.

Last year, a lithium-battery powered train, with a speed of 60 kph, successfully ran on a 1.4-km test monorail line designed by Zhai's team. So far, it has traveled more than 10,000 km in total.

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Last month, Facebook said it had no plans to build a tool to allow non-users to find out what the company knows about them, something that U.S. lawmakers had asked about.

Last month, I took a weeklong trip to the Yellow River's second-largest tributary, the Fenhe River in Shanxi province.

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Last year, the Yichang government issued a document to help curb chemical pollution and transform the industry. By 2020, 134 chemical plants are targeted for closure or relocation.

Last year, Kaidi announced it planned to invest about 1 billion euros (.13 billion) in a new wood-based biodiesel plant in Finland, due to employ about 4,000 people during its construction.