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"The BRICS is never about short-term fluctuation of economic activity. It's always about complementarity," Jeremy Stevens, an economist with Standard Bank, Africa's largest bank headquartered in South Africa, told Xinhua on the sidelines of the business forum.

For example, while China and India are expected to see their economies expand by around 6.5 percent and 7.2 percent respectively this year, there is less optimism about Russia, Brazil and South Africa.

The positive change in the South China Sea was also reflected in the joint communiqué issued by ASEAN foreign ministers, said Wang.

As this year marks the 45th anniversary of China-Germany diplomatic relations, Xi said China is ready to join Germany in consolidating mutual trust, building up more consensus and promoting bilateral cooperation and connectivity, so as to ensure a constant development of the comprehensive strategic partnership between the two countries.

In the past, long-distance free-space quantum communication experiments could only be performed at night, because sunlight, or sunlight noise, prohibits quantum communication in transmission under conditions of high channel loss over long distances.