when coal burns
当煤燃烧时
以上为机器翻译结果，长、整句建议使用 人工翻译 。
When coal burns, it generates heat.
煤在燃烧时产生热量。
youdao
煤燃烧时，产生热量。
When coal burns part of it is left as ash.
煤燃烧时，一部分作为灰烬留了下来。
Phoenix, a tabby cat, was just a few weeks old when she was found in a coal bunker with horrific burns.
BBC: Miracle moggie wins prestigious award at cat ceremony
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