A dragonfly flies on a lotus flower bud at the Nanhu Park in Henyang City, central China's Hunan Province, June 21, 2016. Tuesday marks the summer solstice, the 10th solar term. (Xinhua/Cao Zhengping)

Water lilies are seen in the rain at a park in Changzhou, east China's Jiangsu Province, June 21, 2016. Tuesday marks the summer solstice, the 10th solar term. (Xinhua/Hu Ping)

A bee flies on a lotus flower at the Xihu Park in Henyang City, central China's Hunan Province, June 21, 2016. Tuesday marks the summer solstice, the 10th solar term.(Xinhua/Liu Aicheng)

A lotus flower is seen at the Xihu Park in Hengyang, central China's Hunan Province, June 21, 2016. Tuesday marks the summer solstice, the 10th solar term. (Xinhua/Liu Aicheng)

A lotus flower is seen at the Baohe Park in Hefei, capital of east China's Anhui Province, June 21, 2016. Tuesday marks the summer solstice, the 10th solar term. (Xinhua/Xie Chen)