劍橋詞典a cycling event in which people ride around a track inside a building a number of times . They first all follow a small motor vehicle , and then compete against each other until the end of the race . （場地自行車比賽項目）競輪 She won the women's keirin at the 2012 Olympics. 她在2012奧運的競輪項目上獲勝。 返回 keirin