分类：教育/科学-外语学习-英语考试
问题：Really!That'swhyallpoliceofficer? 
Really! That's why all police rs are taught from the very beginning to be aware of their surroundings. People back over policemen, people shoot policemen, people jump out at policemen -- different kinds of things. So that's probably the most stressful time.请问People back Really! That's why all police rs are taught from the very beginning to be aware of their surroundings. People back over policemen, people shoot policemen, people jump out at policemen -- different kinds of things. So that's probably the most stressful time.请问People back over policemen, people shoot policemen, people jump out at policemen中的back over、jump out at是什么意思？
回答：People back over policemen, people shoot policemen, people jump out at policemen

back over是倒车碾过警察
jump out at是躲在暗处，突然跳出抓住警察。