![CHINA-JIANGSU-SUMMER-LABORERS (CN)](137396019_15344268026121n.jpg)
A subway constructor wearing a mask works at the subway line 7 construction site in Nanjing, capital of east China's Jiangsu Province, Aug. 16, 2018. Despite the scorching heat wave, city-builders in Nanjing stuck to their posts outdoors to ensure the progress of construction projects. (Xinhua/Li Bo)