pile-up process

例句：

1. 1. The pile-up of snow on the road is blocking traffic.
   道路上的积雪堆积阻碍了交通。
2. 2. The company has been heaping up profits by selling its products at a loss.
   该公司通过以亏损出售其产品来积累利润。
3. 3. The workers have been stacking up to make the new machine.
   工人们正在堆积材料来制造新机器。