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Though lunar samples were brought back in U.S. and Soviet missions, scientists need more samples of different ages to piece together a complete history of the moon.
On creating a favorable international economic environment, Xi called for lowering tariff and non-tariff barriers, advancing poverty reduction and economic growth through trade, and help developing countries better integrate into the global market.
Third, the two sides will establish a climate change policy consultation mechanism, promoting policy coordination and practical cooperation on climate change and environmental protection.
These multilateral diplomatic events bear great significance as they came at a tough time when the world is grappling with challenges such as the COVID-19 pandemic, Ye Yu, an associate researcher at the Shanghai Institutes for International Studies, told Xinhua.
He held more than 80 meetings and phone calls with foreign leaders and heads of international organizations, and attended over 20 important diplomatic events, including "cloud diplomacy" through the innovative virtual platform.
来源：资阳报