(TTS發音) 1. grow into a big heap積聚
He didn't go into his office for three days and his work kept piling up. 他3天沒去上班，工作積了一大堆。
Don't let your work pile up； never leave till tomorrow what you can finish today. 不要積壓工作，今天能處理的決不要拖到明天。
They had piled up a lot of earth in one corner of the garden. 他們在花園一角堆積了很多土。
He has piled up a lot of troubles for himself. 他給自己找了一身麻煩。
2. crash衝撞
Several cars and lorries piled up on the motorway in thick fog this morning. 今天早上，高速公路上有好幾輛小汽車及卡車在大霧中相撞。
One car made a sudden stop and the two cars behind it piled up. 一輛小汽車突然停住，後面的兩輛撞了起來。
