pile-on properties

例句：

1. 1. The boxes were stacked neatly in the warehouse.
   箱子整齐地堆放在仓库里。
2. 2. She added a new coat to her wardrobe.
   她把一件新外套添加到她的衣橱里。
3. 3. He piled up the bills and handed them to the cashier.
   他堆起账单递给收银员。