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The 14^th General Meeting of TWAS was held in Beijing nine years ago. Today, we are celebrating the 23^rd General Meeting of TWAS here in Tianjin, which is indeed a grand gathering of the international scientific community. First of all, on behalf of the Chinese people and government, I would like to extend our hearty congratulations on the convening of this meeting and our warm welcome to all TWAS Fellows, scientists and delegates from around the world.