凉炉是指热风炉从生产热态降温至常温的操作过程，是热风炉生产的一个重要环节。
外燃式热风炉因其结构及内衬耐火材料的特点，如果凉炉不当将导致热风炉内衬在凉炉过程中产生严重的结构性破损。
Because of its special structure and refractory characteristics, the hot stove's inner lining would be seriously damaged if it were not cooled in a proper way.
每一次食物凉下来，都会给有害细菌成倍的机会，这会使得下一次你把它们放进烤箱或微波炉加热的时候，全部细菌更难。
Each time it cools down, you offer more opportunities for the harmful bacteria to multiply, it harder to kill them all off the next time you stick them in the oven or microwave.
把曲奇饼拿出来摊凉。给一大炉的饼干加上糖霜带去学校！加一些彩色巧克力米。快完成了…老师能得到这个悦目的。
Take the cookies out to cool. Frost a great big batch for school! Add some sprinkles. Almost done... Teacher gets the fancy one.
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