keirin
noun /ˈkɪərɪn/, /keɪˈrɪn/
/ˈkɪrɪn/, /keɪˈrɪn/
[uncountable]- a racing event in which people cycle a number of times around an indoor track, initially following a small bicycle with a motor and then competing against each other to complete the race
自行车凯林赛（参赛者先是跟在一辆小型摩托车后在室内赛道上完成一定圈数，然后彼此竞速争取最先通过终点）