Workers process a machine component at a workshop of Northern Heavy Industries Group Co., Ltd. in Shenyang, northeast China's Liaoning Province, Jan. 13, 2023. Photo: Xinhua
This aerial photo shows a workshop for making shield tunneling machines in Northern Heavy Industries Group Co., Ltd. in Shenyang, northeast China's Liaoning Province, Feb. 18, 2023. Photo: Xinhua
A worker conducts welding at a workshop of Northern Heavy Industries Group Co., Ltd. in Shenyang, northeast China's Liaoning Province, Jan. 13, 2023. Photo: Xinhua
A worker conducts welding at a workshop of Northern Heavy Industries Group Co., Ltd. in Shenyang, northeast China's Liaoning Province, Jan. 13, 2023. Photo: Xinhua
Workers conduct welding at a workshop of Northern Heavy Industries Group Co., Ltd. in Shenyang, northeast China's Liaoning Province, Jan. 13, 2023. Photo: Xinhua
This photo shows a workshop for making shield tunneling machines in Northern Heavy Industries Group Co., Ltd. in Shenyang, northeast China's Liaoning Province, Jan. 13, 2023. Photo: Xinhua
This photo shows a workshop for making shield tunneling machines in Northern Heavy Industries Group Co., Ltd. in Shenyang, northeast China's Liaoning Province, Jan. 13, 2023. Photo: Xinhua
Workers process a machine component at a workshop of Northern Heavy Industries Group Co., Ltd. in Shenyang, northeast China's Liaoning Province, Jan. 13, 2023. Photo: Xinhua
This aerial photo shows a workshop for making shield tunneling machines in Northern Heavy Industries Group Co., Ltd. in Shenyang, northeast China's Liaoning Province, Feb. 18, 2023. Photo: Xinhua