A man works at the construction site of Nanxi River grand bridge along the China-Laos railway that is under construction in southwest China's Yunnan Province, March 5, 2020. The construction work of the section between Yuxi and Mohan of China-Laos railway project have resumed recently. (Photos: Xinhua)

People work at the construction site of Nanxi River grand bridge along the China-Laos railway that is under construction in southwest China's Yunnan Province, March 5, 2020. The construction work of the section between Yuxi and Mohan of China-Laos railway project have resumed recently.

Aerial photo taken on March 5, 2020 shows the construction site of Yuanjiang River grand bridge along the China-Laos railway that is under construction in southwest China's Yunnan Province. The construction work of the section between Yuxi and Mohan of China-Laos railway project have resumed recently.

People work at the construction site of Nanxi River grand bridge along the China-Laos railway that is under construction in southwest China's Yunnan Province, March 5, 2020. The construction work of the section between Yuxi and Mohan of China-Laos railway project have resumed recently.

People work at the construction site of Nanxi River grand bridge along the China-Laos railway that is under construction in southwest China's Yunnan Province, March 5, 2020. The construction work of the section between Yuxi and Mohan of China-Laos railway project have resumed recently.