火床炉冒黑烟是一个混合不良问题，而混合的关键在于炉拱。
The appearance of black smoke in grate furnaces is due to insufficient mixing, the crux of which lies in the furnace arch.
当火床的热量散发出来，这些水份就会蒸发出来，因为这个原因，把垫身的材料烘干再用就最好了。
When heat from the coals rises up through this, a sauna of sorts is made. For this reason the dryer the insulating materials the better.
我的父亲用土做了一个特殊的床我们叫“炕”，它的中间是空的，这样来自厨房的火就可以通过它使炕能变暖。
My father made our special bed that we call it "Kang" using soil. Its middle is empty so that the fire from kitchen can pass it and make our "Kang" warm.
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