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Hall attended a forum themed "Leading innovation collaborations to build the future of children everywhere" held by UNICEF Tuesday as a side event of CIIE.

Natural gas, including liquefied natural gas (LNG), was set to become the world's second largest energy source by 2030 after coal, as big energy consumers globally sought to cut carbon emissions.

"We love to see the inventions and pursuit by the thousands of businesses here," said Hall, who noted that "learning" was one of their purposes of attending the CIIE, also regarding the expo as a good platform for UNICEF to search for items for procurement.

Lyu said with more people from the two sides knowing each other's language and culture, the China-Spain comprehensive strategic partnership will be further enhanced.

"China and Germany, as major world economies, are important cooperation partners to each other," Li said.