Clay becomes very hard when it is put in a fire or a special oven called a kiln.
VOA: special.2009.01.12
When they invented fire insurance, in the 1600s, there was a lot of skepticism because anyone can burn down their house.
十七世纪时,人们发明了火险,当时存在很多质疑,因为任何人都可以烧毁他们的房子。
Often,when the fire bell rang, other men in the city rushed to help put out the fire.
VOA: special.2009.05.17
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