A train wheel is a round, heavy metal disc that forms part of the undercarriage of a train. It is attached to the axles and is used to support the weight of the train while allowing it to move along the tracks. Train wheels are designed to be durable and resistant to wear, as they are constantly in contact with the rails. They have a slightly tapered shape, which helps the train stay centered on the tracks as it moves. Train wheels play an essential role in ensuring smooth and stable movement, allowing the train to travel efficiently over long distances.

“train wheel”的英语定义和含义

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