calf pen

例句：

1. 1.The farmer keeps his cows in a calf pen.
   农民把他的奶牛养在牛栏里。
2. 2. The calf pen is where the newborn calves are kept.
   新生的小牛犊被放在牛栏里。
3. 3.The calf pen was cleaned out to make room for the new arrivals.
   清理牛栏为新来的小牛腾出空间。