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Photo taken on May 14, 2019 shows the night view of the Olympic Tower in Beijing, capital of China, May 14, 2019. Roads and buildings were illuminated Tuesday evening before the upcoming Conference on Dialogue of Asian Civilizations (CDAC) in Beijing. (Xinhua/Chen Jianli)

Tourists enjoy a light show at the Olympic Forest Park in Beijing, capital of China, May 14, 2019. Roads and buildings were illuminated Tuesday evening before the upcoming Conference on Dialogue of Asian Civilizations (CDAC) in Beijing. (Xinhua/Ju Huanzong)

$Photo taken on May 14, 2019 shows the night view of the National Stadium, also known as the Bird\'s Nest, and the Linglong Tower in Beijing, capital of China. Roads and buildings were illuminated Tuesday evening before the upcoming Conference on Dialogue of Asian Civilizations (CDAC) in Beijing. (Xinhua/Chen Jianli)$

Photo taken on May 14, 2019 shows the night view of the National Stadium, also known as the Bird's Nest, and the Linglong Tower in Beijing, capital of China. Roads and buildings were illuminated Tuesday evening before the upcoming Conference on Dialogue of Asian Civilizations (CDAC) in Beijing. (Xinhua/Chen Jianli)

Photo taken on May 14, 2019 shows the night view of the Olympic Tower in Beijing, capital of China. Roads and buildings were illuminated Tuesday evening before the upcoming Conference on Dialogue of Asian Civilizations (CDAC) in Beijing. (Xinhua/Shen Bohan)

Combo photo taken on May 14, 2019 shows the night view of the Olympic Tower in Beijing, capital of China. Roads and buildings were illuminated Tuesday evening before the upcoming Conference on Dialogue of Asian Civilizations (CDAC) in Beijing. (Xinhua/Ju Huanzong)

$Photo taken on May 14, 2019 shows the night view of the National Stadium, also known as the Bird\'s Nest, in Beijing, capital of China. Roads and buildings were illuminated Tuesday evening before the upcoming Conference on Dialogue of Asian Civilizations (CDAC) in Beijing. (Xinhua/Shen Bohan)$

Photo taken on May 14, 2019 shows the night view of the National Stadium, also known as the Bird's Nest, in Beijing, capital of China. Roads and buildings were illuminated Tuesday evening before the upcoming Conference on Dialogue of Asian Civilizations (CDAC) in Beijing. (Xinhua/Shen Bohan)

$Photo taken on May 14, 2019 shows the night view of the National Stadium, also known as the Bird\'s Nest, and the National Swimming Center, also known as the Water Cube, in Beijing, capital of China. Roads and buildings were illuminated Tuesday evening before the upcoming Conference on Dialogue of Asian Civilizations (CDAC) in Beijing. (Xinhua/Li He)$

Photo taken on May 14, 2019 shows the night view of the National Stadium, also known as the Bird's Nest, and the National Swimming Center, also known as the Water Cube, in Beijing, capital of China. Roads and buildings were illuminated Tuesday evening before the upcoming Conference on Dialogue of Asian Civilizations (CDAC) in Beijing. (Xinhua/Li He)

Photo taken on May 14, 2019 shows the night view of the China National Convention Center and the Olympic Tower in Beijing, capital of China. Roads and buildings were illuminated Tuesday evening before the upcoming Conference on Dialogue of Asian Civilizations (CDAC) in Beijing. (Xinhua/Li He)