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"Chinese is really hard to learn," he says.

"Classes that are digitalized and integrated are playing an increasingly important role in the field of education, which also reflects the integrated teaching model we support and is quickly becoming a new normal," said Gao Han, vice-president of ClassIn Interactive Class.

"China will continue its proactive participation in the global governance of the world's intellectual property," Chen was quoted by China Central Television as saying.

"Countries, while maintaining their own security, should take into account other countries' security," Xi said. He asked major nations to offer more support for underdeveloped countries and regions in security and development.

"Citing the Joint Declaration as a justification for irresponsible remarks and interference in Hong Kong affairs has no valid ground. This goes against not only 'one country, two systems', but also the basic norms governing international relations," he said.