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重点讲解：
1.cordon off隔离；
The protest started in front of the city government in the main People's Square, home to a horse racing track during Shanghai's colonial heyday, before police moved in to cordon off the area.
游行从市政府门前的人民广场开始，其前身为殖民地时期的跑马场。随后警察对该地区拉起了警戒线。
2.ram撞击；
The thieves fled, ramming the policeman's car.
小偷们撞了警车，逃跑了。
