Aerial view at the break of dawn of Changyu Island in Fuzhou City, southeast China's Fujian Province on Sept. 4, 2018. Changyu Island, located in Songxia Town of Fuzhou City, is an isolated island seldom known to the public.(Photos: Xinhua)

The couple Wang Kaiquan and Lin Zhujin instruct students on doing sports Changyu Primary School on Changyu Island of Fuzhou City, southeast China's Fujian Province, Sept. 4, 2018.

The couple Wang Kaiquan and Lin Zhujin pay a visit to students' home on Changyu Island of Fuzhou City, southeast China's Fujian Province, Sept. 3, 2018. Limited living conditions result in a decline in population. Islanders want to move out while outsiders can't get used to the tough environment there.

The couple Wang Kaiquan (R) and Lin Zhujin prepare for class at the dormitory of Changyu Primary School on Changyu Island of Fuzhou City, southeast China's Fujian Province, Sept. 3, 2018.