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But none have managed to achieve a dominant position in the sector.

But at least inside China, it faces fierce competition from JD, another e-commerce giant, which runs its own warehouses, fleet and other logistics components and already achieves same-day delivery in a number of cities.

But Trump and the Transportation Security Administration pushed back on any suggestion that the call-outs at the agency represented a "sickout" that was having a significant effect on US air travel. TSA said it screened more than 2.2 million passengers Sunday, a historically busy day due to holiday travel. Ninety percent waited less than 15 minutes, the agency said.

But Zhang has not been merely strolling in public parks and scenic spots or hiking in mountain trails－the 52-year-old is an equestrian enthusiast, one of many members of an increasingly popular leisure activity that had been severely disrupted by the novel coronavirus outbreak.

But analysts dismissed the possibility of continued, sharp price hikes as Wednesday's mild rise signaled the trend has become more stable.