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Another @awscloud hack, another empty excuse. @ajassy and @JeffBezos owe the American people answers. https://t.co/IZtEPRR3ap

Ant Group also unveiled AntChain Station, an all-in-one workstation that reduces the deployment time of the company's blockchain-based solutions by as much as 90 percent. This enables enterprise clients to set up AntChain within an hour, which is significantly lower than the previous average set-up time of 10 hours.

Another trick takes advantage of what’s called semi-supervised learning, which helps Alexa distinguish between the actual wake word and words that can sound similar. (For example, “Lexus” as opposed to “Alexa.”)

Another returnee, Frank Leung, added that his internship at China Minsheng Bank - the nation's first bank owned mostly by nongovernmental enterprises - gave him opportunities to learn the fundamental business of a bank. Such opportunities are rare in Hong Kong, he said.

Apart from Changsha, Baidu is testing autonomous driving with passengers in Beijing, Cangzhou in North China's Hebei province, and other places.