路障roadblocks
游行parade
游行人士marchers
学生领袖student leaders
学联成员Hong Kong Federation of Students' members
横额placard
历史事件historical event
激动的agitated
筑成人墙forming a human shield
静坐stage a sit-in
恳求学生取消集会to beg students to give up their protest
烛光晚会candlelight vigil