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"Delivery of pharmaceutical materials can be tricky and needs proper deployment of cold chain logistics," Reddington added.
"Different crops and fruit trees need different types of pesticide and fertilizer," Ran said. "The total amount of the chemicals used by the farmers was huge which severely damaged the soil and water."
"Ehang's rapid development has been based on the city's open, innovative business environment," Xiong said.
"Disruptions in supply would cause difficulty in maintaining production," Wang said.
"Don't assume because you're out and about with people you know, that you can relax on the social distancing -- because you can't."