Constructors work at the construction site of the China-Russia Tongjiang-Nizhneleninskoye cross-border railway bridge, Aug. 17, 2021. The construction finished its tracklaying work on Tuesday. The railway bridge, with a designed annual throughput capacity of 21 million tonnes, connects Nizhneleninskoye in Russia with the border city of Tongjiang in Heilongjiang. (Xinhua/Zhang Tao)