Photo taken on Feb. 2, 2019 shows the construction site of Nam Khone super major railway bridge in the north of Lao capital Vientiane. All the key projects along the China-Laos railway are set to be completed specifically on exact dates, such as those of the tunnels to be bored through, bridges' closure and concrete casting of substructures. (Xinhua/Laos-China Railway Co. Ltd)