A vehicle, used especially by small children, that has three wheels, one at the front and two at the back, and is usually propelled by pedals.是什么意思_A vehicle, used especially by small children, that has three wheels, one at the front and two at the back, and is usually propelled by pedals.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句