A child views butterflies at Xi'an Contemporary Art Museum in Xi'an, northwest China's Shaanxi Province, July 14, 2019. An exhibition of insects was held in Xi'an to popularize scientific knowledge and enrich children's life in summer vacation. (Xinhua/Li Yibo)

A child views a mantis at Xi'an Contemporary Art Museum in Xi'an, northwest China's Shaanxi Province, July 14, 2019. An exhibition of insects was held in Xi'an to popularize scientific knowledge and enrich children's life in summer vacation. (Xinhua/Li Yibo)

A child views insects at Xi'an Contemporary Art Museum in Xi'an, northwest China's Shaanxi Province, July 14, 2019. An exhibition of insects was held in Xi'an to popularize scientific knowledge and enrich children's life in summer vacation. (Xinhua/Li Yibo)

A man and a child view insects at Xi'an Contemporary Art Museum in Xi'an, northwest China's Shaanxi Province, July 14, 2019. An exhibition of insects was held in Xi'an to popularize scientific knowledge and enrich children's life in summer vacation. (Xinhua/Li Yibo)