n.堆积；连环相撞
The problem delayed some flights at the New York airport and caused a luggage pileup at ticket counters. 该问题造成一些纽约机场的航班延误并使得乘客行李在票务处堆积如山。
There is a serious pileup on the expressway. 高速公路上发生了一起的汽车追尾相撞的交通事故。
Stopping the car short caused a pileup on the superhighway. 这辆汽车突然刹车使高速公路上发生连环车祸。
