Jisho

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Wikipedia definition
1. Gravity racerA gravity racer is a motorless vehicle capable of holding a driver (usually a child) built for the purpose of racing or recreation. They are propelled by gravity and can achieve speeds upwards of 112 km/h (70 miles per hour).
Read “Gravity racer” on English Wikipedia
Read “ソープボックス” on Japanese Wikipedia
Read “Gravity racer” on DBpedia

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