sheet piling

例句：

1. 1. The sheets werepiled high on the bed.
   床单被叠得高高的在床上。
2. 2. Theyhad to pile up thefurniture for the move.
   他们不得不把家具堆起来搬家。
3. 3. The pileof books was too heavy to carry.
   那堆书太重，搬不动了。