The proofer is a steam box with heat.

发酵箱是可以加热的蒸箱。

Moisture and heat, and the bread rises and then when it's at a certain level in the proofer you take it out and put it in the oven.

在湿气和热量的作用下，面包会膨起，在到达一定程度后就可以把它拿出来放进烤箱里了。