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