He spent eight months cleaning out calf pens and doing construction work.
他花了八个月的时间清理小牛圈并进行建筑工作。
英语百科
Pen (enclosure)
A pen is an enclosure for holding livestock. The term describes multiple types of enclosures that may confine one or many animals. Construction and terminology vary depending on the region of the world, purpose, animal species to be confined, local materials used, and cultural tradition. Pen or penning as a verb refers to the act of confining animals in an enclosure.