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The substance can be ignited like solid ethanol, which is why it is called combustible or flammable ice.

It is an environmental shield which reduces sandstorms.

"Practice has told us that the governance of the CPC concerns not only the future and destiny of the Party, but also that of our nation," he said. "We must improve the governance of the Party with greater determination, courage and effort."

China's "suspension for suspension" proposal requires the DPRK to suspend its missile and nuclear activities in exchange for the suspension of large-scale military drills between the United States and the Republic of Korea (ROK).

The Chinese leader urged all members to cope with risks and challenges so as to steer digital economy toward openness and inclusiveness, adding that the G20 bloc needs to expand access to digital economy and reduce the digital divide between the North and the South.