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重點講解：
1.cordon off隔離；
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.
游行從市政府門前的人民廣場開始，其前身為殖民地時期的跑馬場。隨后警察對該地區拉起了警戒線。
2.ram撞擊；
The thieves fled, ramming the policeman's car.
小偷們撞了警車，逃跑了。
