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Biden also said he expected Harris, with whom he clashed during the Democratic debates, to challenge him at times.

Biden attacks Trump's climate policy as wildfire ravages US west coast - World - Chinadaily.com.cn

Besides bridging the rural-urban gap in terms of living standards, digital technology has also helped encourage migrant workers to return to villages, which have seen large numbers of farmers leave to find work in cities over past years.

Bezos introduced the concept of the company’s three existing pillars in his 2014 annual letter to shareholders. They are: Amazon’s third-party marketplace, which represented more than half of units sold on Amazon for the first time in 2017; the Amazon Web Services cloud computing division, which posted .5 billion in revenue last year and kept the overall company in the black with .3 billion in revenue; and Amazon Prime, which Bezos disclosed in this year’s annual letter has surpassed 100 million members.

Biden, 77, buoyant after a second-place finish in Nevada following middling showings in the first two contests, has been looking to the Palmetto State to propel him.