piling-up batch by batch

例句：

1. 1. The pile of books on the desk is too heavy for me to carry.
   桌上的一堆书对我来说太重了，我搬不动。
2. 2. The company has been piling up profits in recent years.
   这家公司近年来一直在积累利润。
3. 3. She was piling up her savings for a down payment on a new house.
   她正在为购买一所新房子的首付积攒储蓄。