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"China and Brazil have forged a mature and solid relationship as the largest developing countries respectively in the Eastern and Western Hemispheres and leading emerging economies," Xi said.

"We must win the battle against poverty, even if I'm the only one left in it."

During his meeting with Duda, Zhang said that traditional friendship between the two peoples is consolidated. In the past two years, Chinese President Xi Jinping and Duda exchanged visits and the two nations work to build a comprehensive strategic partnership, which opens a new chapter in the Sino-Polish relations, Zhang said.

During his leisure time, Crossman teaches local people English. Currently he is helping staff at a Starbucks near his home, telling them how to say useful words such as "set meal" and "discount."

Pan's team chose a wavelength of 1,550 nanometers and developed free-space single-mode fibre-coupling technology and ultra-low-noise upconversion single-photon detectors to achieve the daytime distribution.