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Devin O'Malley, Pence's press secretary, tweeted on Tuesday evening that the vice president had tested negative again in the afternoon.

Domestic sales grew by 107.5 percent year-on-year to reach over 130,000 digging machines, while exports rose 32 percent compared with 2016 to sell over 9,600 digging machines overseas.

Developers have embraced Alexa, building more than 3,000 skills since Amazon opened it up last year.?Developers who want to add to Alexa’s abilities can write code that works with Alexa in the cloud, letting the smart assistant do the heavy lifting of understanding and deciphering spoken commands.

Didi CEO Cheng Wei said the company expected greater use of artificial intelligence to revolutionize safety and efficiency in the urban transit system.

Doctors warn that children's body temperature rises three to five times faster than adults in the same environment, so that parents should never leave their kids alone in the car at any time.