Aerial photo taken on June 1, 2019 shows the Nam Khone super major bridge under construction in Laos. The last T-shaped beam was laid between two piers of the Nam Khone super major bridge, the longest bridge along the China-Laos railway, on Saturday in Lao capital Vientiane, marking the completion of the beam erection stage of the bridge construction. (Xinhua/Zang Heng)