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Dark matter, which cannot be seen or touched, is one of the great mysteries of science. Scientists calculate that normal matter, such as galaxies, stars, trees, rocks and atoms, accounts for only about 5 percent of the universe. However, about 26.8 percent of the universe is dark matter and 68.3 percent dark energy.
China must build and improve mechanisms for pushing forward high-quality development, including indicators, policies, standards, statistical and performance assessment systems, according to the Wednesday statement.
He urged concerted efforts to promote the stable and long-term development of relations on the basis of the four political documents signed by both countries and in the spirit of drawing lessons from history and facing up to the future.
China will continue to assist Djibouti in improving its healthcare and deepen cooperation in human resources development as well as people-to-people exchanges, said Xi.
Trust may be impaired because of a certain incident at a time, but its reconstruction requires sustained efforts by all walks of life, said the premier.
来源：资阳报