As a result, much of it remains in utility holding pens.

因此，大部分的乏燃料棒依然保存在乏燃料池里。

youdao

She takes the captives to holding pens at her house until she can let them go far away from human activity.

她把捕获的蛇在家中暂时圈养起来，直至将它们在远离人类活动的地方放生。

youdao

Imagine a city where you don't drive in loops looking for a parking spot because your car drops you off and scoots off to some location to wait, sort of like taxi holding pens at airports.

想象一下，在一座城市，你不用绕着圈地寻找停车位，因为你的车会把你放下，然后快速开到某个地方等着，有点像机场的出租车等候区。

youdao

Most do not, and all too often the owners cross swords with the original landholder: a strange creature who counts on irrigation water, operates machinery at odd hours, and offends his neighbours with smelly cattle-holding pens.

ECONOMIST: Western water rights

They are warehoused in holding pens, or sent to long term pastures in the mid-west or prisons (for humans) and then, a great many disappear out the back gates for a trip to death row Mexican style.

FORBES: No American Horse Steak for You, Europeans