Visitors look at the machines and devices exhibited at the 2019 South-East Europe Belgrade Building Expo (SEEBBE) in Belgrade, Serbia, on April 17, 2019. Under the slogan "We build the future now," the international Building Trade Fair opened here on Wednesday, offering technologically advanced machines and materials of interest to the booming construction sector in Serbia and the region at large. (Xinhua/Nemanja Cabric)