田野角落里有一个干草堆。

There is a ___stack of hay in the corner of the field.

农夫们正在把干草堆成垛，以防下雨。

The farmers are ___stacking the hay to protect it from the rain.

她弯腰捡东西时扭伤了腰。

She ___hurt her back when bending down to pick something up.