This diptych photo taken on April 27, 2019 shows Tang Huijun, a scaffold worker with China Construction Third Engineering Bureau Co, Ltd, posing in his daily work outfit (L) and in a formal dress (R) in Xining, Northwest China's Qinghai province. In this series of portrait diptychs, frontline workers with China Construction Third Engineering Bureau Co, Ltd appear in contrastingly different dress styles, but nevertheless manage to show the elegance of their professions. (Photos: Xinhua)

This diptych photo taken on April 27, 2019 shows Chen Huayan, a materials specialist with China Construction Third Engineering Bureau Co, Ltd, posing in her daily work outfit (L) and in a formal dress (R) in Xining, Northwest China's Qinghai province.

This diptych photo taken on April 27, 2019 shows Xi Yungang, a welder with China Construction Third Engineering Bureau Co, Ltd, posing in his daily work outfit (L) and in a formal dress (R) in Xining, Northwest China's Qinghai province.

This diptych photo taken on April 27, 2019 shows Liu Caixia, a concrete rebar worker with China Construction Third Engineering Bureau Co, Ltd, posing in her daily work outfit (L) and in a formal dress (R) in Xining, Northwest China's Qinghai province.

This diptych photo taken on April 27, 2019 shows Liu Jun, a construction worker with China Construction Third Engineering Bureau Co, Ltd, posing in his daily work outfit (L) and in a formal dress (R) in Xining, Northwest China's Qinghai province.

This diptych photo taken on April 27, 2019 shows He Maoming, a lift operator with China Construction Third Engineering Bureau Co, Ltd, posing in her daily work outfit (L) and in a formal dress (R) in Xining, Northwest China's Qinghai province.

This diptych photo taken on April 27, 2019 shows Huang Renyi, a carpenter with China Construction Third Engineering Bureau Co, Ltd, posing in his daily work outfit (L) and in a formal dress (R) in Xining, Northwest China's Qinghai province.

This diptych photo taken on April 27, 2019 shows Wang Gaiyan, a sanitation worker with China Construction Third Engineering Bureau Co, Ltd, posing in her daily work outfit (L) and in a daily dress (R) in Xining, Northwest China's Qinghai province.