main - larger, more important, or having more influence than others of the same type, traffic - the number of vehicles moving along roads, or the amount of aircraft, trains, or ships moving along a route, petrol - a liquid obtained from petroleum, used especially as a fuel for cars and other vehicles, design - to make or draw plans for something, for example clothes or buildings, invention - something that has never been made before, or the process of creating something that has never been made before, instead - in place of someone or something else, electricity - a form of energy that can be produced in several ways and that provides power to devices that create light, heat, etc., bulb - glass part of an electric lamp, which gives out light when electricity passes through it, torch - a small light that is held in the hand and usually gets its power from batteries,

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