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"As two of largest players in that economy that is not only in our interest, it is our responsibility," De Gucht added.

During the two-day visit, Xi is expected to hold talks with his Turkmenian counterpart Gurbanguly Berdymukhamedov.

"The Chinese economy will keep growing in the long term, in a sustained and healthy way," he said, highlighting the country's expanding domestic demand, as well as its efforts for new-type industrialization, urbanization, the application of information technology, agricultural modernization and its strategy of green development.

The Afghanistan hopes China will continue to play a constructive role in Afghanistan's push to realize peace, security and stability as well as to improve ties with neighboring countries, Karzai said.

If any farmland or water is seriously polluted, the area should be taken out of use, and supervision should be stepped up on food safety.