This aerial photo shows the construction site of a photovoltaic (PV) power project in north China's Tianjin, Feb. 7, 2023. (Xinhua/Sun Fanyue)

Efforts have been made to promote the construction of key projects in north China's Tianjin. The city has announced 673 key construction projects in 2023, with a total investment of 1.53 trillion yuan (about 224.8 billion U.S. dollars).

This aerial photo shows the construction site of an ethylene project in north China's Tianjin, Feb. 9, 2023. (Xinhua/Sun Fanyue)

A constructor directs as the components of photovoltaic (PV) panels are lifted at the construction site of a PV power project at a sea crystal salt field in north China's Tianjin, Feb. 7, 2023. (Xinhua/Sun Fanyue)

This aerial photo shows a large machine lifting construction equipments for Tianjin Rail Transit Line 8 in north China's Tianjin, Feb. 11, 2023. (Xinhua/Sun Fanyue)

A constructor works at the construction site of a section of Tianjin Rail Transit Line 8 in north China's Tianjin, Feb. 11, 2023. (Xinhua/Sun Fanyue)

Constructors install the components of photovoltaic (PV) panels at the construction site of a PV power project at a sea crystal salt field in north China's Tianjin, Feb. 7, 2023. (Xinhua/Sun Fanyue)

A constructor works at the construction site of a section of Tianjin Rail Transit Line 8 in north China's Tianjin, Feb. 11, 2023. (Xinhua/Sun Fanyue)