Run down
撞倒；缩减；耗尽
The batteries have run down.
电池电量用完了。
The old man was run down by a car.
老人被一辆小汽车撞倒了。
The labour force in the city has been running down in recent years.
这个城市的劳动力近年来一直在减少。
Run for
竞选
He wishes he could run for the mayor one day.
他希望有一天他能竞选市长。
Run in
拘留；逮捕；跑进
The police ran him in for drunk driving.
因为醉酒驾车, 警察拘留了他。
His cat ran in when he opened the bedroom door.
当他打开卧室的门时，他的猫跑了进来。
Run into
偶然遇到（某人）；陷入（困境）；撞上；合计为
He ran into his ex-girlfriend in the street the other day.
前几天他在街上碰到了他的前女友。
They ran into serious trouble due to his mistake.
由于他的错误，他们陷入了严重的困境。
The penalties will probably run into hundreds of dollars.
罚款可能会高达数百美元。
He has run his car into a tree.
他把车撞到树上了。
