derrick hay stack

例句：

1. 1. The farmer has built a derrick to lift the heavy load from the field.
   农民建了一个吊车来从田地里吊起沉重的货物。
2. 2. The animals were gathered in the derrick for the annual gathering.
   动物们聚集在干草堆上参加一年一度的集会。
3. 3. The farmer carefully stacked the bales of hay on top of each other to keep them dry.
   农民小心翼翼地把干草捆叠在一起，以保持它们干燥。