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"But the timing and mechanism of volatile delivery has been hotly debated. Ours is the first scenario that can explain the timing and delivery in a way that is consistent with all of the geochemical evidence."

"COSCO Shipping's philosophy is cost-effectiveness. ... Noatum Ports is following it," he said.

"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.

"Challenges ahead include ensuring effective implementation across all stages from planning to completion, and improving awareness of the guide among those involved in offering such services," said Zhang Lijun, an official of the city's housing and urban-rural development bureau.

"But they should also keep a check on some unprofessional teachers," she said.