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"By choosing to visit China, you show that you attach great importance to developing relations with my country, and we, too, share the same readiness to develop relations," Xi said.

"China has an ambitious plan to achieve high-speed tech targets by 2050, and I think they would accomplish it before this date," he said.

"CNPC's decline in oil output should ease in the second half of this year and its gas-production growth may accelerate."

"But there are fewer restrictions." It does seem fair that Crispr- Cas9, being largely a US-developed tool, should first be tried on humans in the US, but the hoops and red tape of the review process by the Food and Drug Administration (FDA) have delayed the most promising experiment - a team led by Dr Carl June at the University of Pennsylvania - for two years.

"By improving their income and working conditions, we believe healthcare teams in rural areas will be more stable," he said.