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"I have observed that the grass that coexists with the crops functions as a regulating factor of the microclimate by keeping the soil humid," Wang said.
He said one surprise they share in the letter is how much Africa is the world's youngest continent. Between now and the end of the century, an increasing proportion of young people will come from countries on the African continent.
In his congratulatory message, Xi said China-U.S. relations have experienced ups and downs and made historic progress over the past 40 years, bringing huge benefits to the two peoples and contributing greatly to world peace, stability and prosperity.
The report also noted that China's fiscal budget for medical services in 2018 was 1.5 trillion yuan.
"China welcomes the entry of all competitive commodities and technology in the world, and we will strictly protect intellectual property rights and speed up the market transformation of innovation results," the premier said.