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GUIYANG, May 26 (Xinhua) -- An international expo on big data opened Sunday in southwest China's Guizhou Province, focusing on the latest innovation of the technology and its applications.

Secondly, the two leaders reiterated that their countries will hold fast to various principles stipulated in the four political documents between China and Japan and implement the political consensus that they are cooperative partners who never pose a threat to each other.

On Friday, the Chinese government decided to establish a list of unreliable entities to safeguard national security, public interests, and the legitimate rights and interests of Chinese enterprises.

The average PM2.5 density, a key indicator of air pollution remained unchanged at 44 micrograms per cubic meter over the period and the average density of PM10 and sulfur dioxide fell 2.6 percent and 13.3 percent respectively year on year.

Some 337 Chinese cities enjoyed good air quality on 80.3 percent of days from January to May this year, up 0.6 percentage points from the same period last year. Nearly 120 cities met the air quality standards, including 20 cities joining this year, data of MEE showed.