N（名词） a person who participated, esp in the 1960s, in an organized tour, usually by public transport in the South, in order to protest against racism and put federal laws on integration to the test 自由乘车客; 20世纪60年代在美国南部有组织的活动中通过乘坐公共交通工具以抗议种族歧视和考验消除种族差别待遇联邦法律的人 [美国英语]