Visitors tour an evening dinosaur exhibition held as part of the 2019 Guangzhou Science and Technology Week at Guangdong Science Center in Guangzhou, south China's Guangdong Province, May 24, 2019. (Xinhua/Liu Dawei)

Visitors tour an evening dinosaur exhibition held as part of the 2019 Guangzhou Science and Technology Week at Guangdong Science Center in Guangzhou, south China's Guangdong Province, May 24, 2019. (Xinhua/Liu Dawei)

Visitors take part in an activity during an evening dinosaur exhibition held as part of the 2019 Guangzhou Science and Technology Week at Guangdong Science Center in Guangzhou, south China's Guangdong Province, May 24, 2019. (Xinhua/Liu Dawei)

Visitors tour an evening dinosaur exhibition held as part of the 2019 Guangzhou Science and Technology Week at Guangdong Science Center in Guangzhou, south China's Guangdong Province, May 24, 2019. (Xinhua/Liu Dawei)

Visitors tour an evening dinosaur exhibition held as part of the 2019 Guangzhou Science and Technology Week at Guangdong Science Center in Guangzhou, south China's Guangdong Province, May 24, 2019. (Xinhua/Liu Dawei)