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He stressed the need to focus on combat research and commanding, to advance work in all areas and accelerate developing strong and efficient joint-operation commanding institutions for theater commands to comprehensively boost the military's battle-winning ability.

It is very important for the heads of state of the United Stats and China to keep frequent, direct communication, Trump said, and he and Xi should keep in touch with each other. Trump also said he attaches importance to a good relationship with Xi and is willing to extend, through Xi, his good wishes to the Chinese people.

The delegation arrived in Guangxi on Sunday for the anniversary celebrations.

BEIJING, Dec. 18 (Xinhua) -- China held a grand gathering Tuesday to celebrate the 40th anniversary of the country's reform and opening-up, a great revolution that has changed the destiny of the Chinese nation and also influenced the world.

Under the current pricing mechanism, if international crude oil prices change by more than 50 yuan per tonne and remain at that level for 10 working days, the prices of refined oil products such as gasoline and diesel in China will be adjusted accordingly.