Pray tell, what is this magic wheel box?

请告诉我 这个神奇的带轮子的盒子是个什么玩意儿？

I run back into the hospital to watch the small team arrive through the elevator doors wheeling the box with the kidney on ice.

我跑回医院，看着这支小型团队推着冰冻的肾脏箱通过电梯门出现。