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"By hammering on each wooden railroad tie, workers can tell how much it has eroded and when to replace them with new ones," Dong said, adding a routine check of the ties is arranged once a month.

"China is the largest exporting country of crude drugs. In the short term, the total orders might go down, but in the long term, the impact will be transferred to the local pharmaceutical companies in the US," said Shi Lichen, an industry analyst and the founder of a third-party medical services platform.

"China hopes, its seems, to play a critical role in ensuring that the talks between Trump and Kim will reach a satisfactory agreement and to avoid a failure of the talks in May that might in turn increase the risk of military action," said John Nilsson-Wright, a senior research fellow for Northeast Asia at the think tank Chatham House.

"Chairman Kim has told us he's prepared to do it, and now the mission is to deliver on that," he added.

"China is strongly dissatisfied and resolutely opposes the rejection, as the US government tried to mix the concepts of the surrogate country approach and market economy status to mislead the public," the ministry said in a statement.