pile knit fabric

例句：

1. 1. The boxes were piled high on the shelves.
   箱子被堆得高高的放在架子上。
2. 2. The books were piled in a heap on the floor.
   书被堆在地板上。
3. 3. The snow was piled up against the fence.
   雪堆在篱笆旁。