firn

例句：

1. 1. The farmer has a large haystack in the field.
   农民在田野里有一个大干草堆。
2. 2. The cows graze on the hay stack.
   牛们在干草堆上吃草。
3. 3. The farmer needs to buy more hay for the winter.
   农民需要买更多的干草过冬。