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A trolley is a small vehicle with wheels that can carry things. People can push trolleys.
There are different kind of trolleys. There are shopping trolleys which are used in supermarkets and other large stores with self-service. In American English these are called shopping carts. Customers can put things they want to buy in the trolley and then pay for everything at the checkout. Usually they are then allowed to wheel the trolley with the things they have bought out to their car.
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