He said Washington has spread the false accusation since February 2017 that US staff in Cuba reported health symptoms such as brain damage, hear loss, nausea and instability due to alleged use of long-range acoustic equipment.
He said one important task of the national security law for the Hong Kong SAR is to "prevent, suppress and punish" collusion with a foreign country or with external elements to endanger national security.
He pointed out that certain progress has been achieved since leaders of both countries agreed on aligning the Belt and Road Initiative with the Eurasian Economic Union, and this will foster an enabling climate for the region.
He said it was notable that three of the 20 exhibitors at the expo were based in China, which highlighted the country's interest in adopting innovative sanitation technology for the domestic and global markets.
He said his friend had complained that these people, who have no training in journalism, always stand in the way of cameras, blocking the police during their operations.
He said due to his age he didn't exhibit good academic performance until his third year in middle school, when he found a study method just right for him. He has been an excellent student since then.
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He said that paper first made its way into Europe through Spain in the 1500s, thanks to trade along the ancient Silk Road.
He said it was important that more countries had good digital access, otherwise it would become a source of greater inequality in the world, contrasting that while in the West and in parts of Asia, digital penetration was around 80 percent, this was not the case everywhere.
He pointed out the importance of building an ecological civilization and social governance based on collaboration, participation and common interests.
He said facts that must be respected include: "Hong Kong has returned to China; China has sovereignty over Hong Kong; the 'one country, two systems' principle must be seen in its totality; Hong Kong-related issues must be handled appropriately."