1. 清障车：police car 警车 | wrecker 清障车 | ambulance 急救车

2. 施救船：wrecker 打捞人员 | wrecker 施救船 | wrecking anchor 救助用的锚

3. 打捞人员：wrecked 失事的 | wrecker 打捞人员 | wrecker 施救船

4. 肇事者：wreckage 失事 | wrecker 肇事者 | wrecking car 救援车

1. （事故发生后拖走坏损车辆的）救援车，救险车，清障车
    A wrecker is a motor vehicle which is used to pull broken or damaged vehicles to a place where they can be repaired or broken up, for example after an accident.

wrecker在线翻译

2. 拆除废旧建筑者
    Wreckers are people whose job involves destroying old, unwanted, or damaged buildings.

3. see also: wreck

1. a truck equipped to hoist and pull wrecked cars (or to remove cars from no-parking zones)

    Synonym: tow trucktow car

2. someone who commits sabotage or deliberately causes wrecks

    Synonym: saboteurdiversionist

3. someone who demolishes or dismantles buildings as a job