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As with much in retail innovation these days, Amazon is driving the trend. The Seattle-based tech giant made headlines this year when it publicly opened up the first Amazon Go, a “grab-and-go” cashier-less store that lets customers?take items off the shelf and walk out without going through a traditional checkout line or register. The experience is powered by a smartphone and an array of cameras and sensors. Amazon is already opening up more stores in Seattle and across the U.S.

As the president departed the White House, Trump told reporters, "It's a very, very sad day for me, personally."

As some in Washington think tanks and the diplomatic community have floated the idea of building a "coalition of democracies" to take on China, Kissinger said, "I think a coalition aimed at a particular country is unwise, but a coalition to prevent dangers is necessary where the occasion requires."

As the compiling work is going on, relevant departments will soon solicit opinions and suggestions from officials, the public, as well as the specialists and scholars.

As the first product of the Audi brand to fully launch its electrification strategy, e-tron is a market leader in luxury c-class electric sport utility vehicles.