burnt coal

例句：

1. 1. The fire was so fierce that it burned the coal to ashes.
   火势太猛，把煤炭烧成了灰烬。
2. 2. The old man used to burnt coal for warmth in winter.
   老人们冬天常用烧焦的煤炭取暖。
3. 3.The coal mine is located in a remote area where burning coal is not allowed.
   煤矿位于一个偏远地区，那里不允许燃烧煤炭。