传统上，煤炭都是在开采地燃烧——尤其是用以取暖和发电的动力煤或电煤。
Traditionally, coal is burned near where it is mined - particularly so-called thermal or steaming coal, used for heat and electricity.
理由是煤燃烧过后省些的煤灰含有放射性元素，尤其是铀和钍。
The reason is that the ash left over when coal is burned contains radioactive elements, notably uranium and thorium.
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