Relacionar Columnas Talking About FunctionsVersión en línea Matching por Logos Sprachinstitut 1 The airflow is regulated by the valve. 2 The vehicle is powered by the engine. 3 The purpose of the wheel is to steer the truck. 4 The shelf is bolted to the wall with screws. 5 The function of the switch is to turn the machine on and off. 6 The purpose of the backup file is to keep our data safe. 7 The bridge is supported by steel pylons. The switch turns the machine on and off. Screws bolt the shelf to the wall. The wheel steers the truck. Steel pylons support the bridge. The valve regulates the airflow. The backup file keeps our data safe. The engine powers the vehicle.