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SHENZHEN, June 22 (Xinhua) -- China has made extraordinary progress since the reform and opening up drive started 40 years ago, and its experience is very useful for other countries, according to a UN official.

Xi called for effective prevention of ecological and environmental risks, as ecological and environmental security is an important part of national security, as well as an important guarantee to achieve sustainable and healthy development of the Chinese economy and society.

The six-lane superhighway will connect the country's southern port city of Karachi with northwestern city Peshawar through the populated provinces of Punjab and Sindh.

For years, China has constantly optimized its legislation and enhanced its administrative and judical efforts in IPR protection. Its regulations and levels of protection are in line with international rules.

As the two countries are at a critical stage of national development and rejuvenation, Xi said, China and Tajikistan should deepen bilateral comprehensive strategic partnership to benefit the two peoples more widely.