1. The coal was burnt to cinders.
    煤烧成了灰。

2. Many houses crumbled into cinders.
    许多房子化为了灰烬。

1. 煤渣：cim 计算机一体化制造 | cinder 煤渣 | cine camera 电影摄影机

2. 炉渣：cillery 叶饰 | cinder 炉渣 | cinder aggregate 矿渣骨料

3. 煤渣, 灰烬：ashes灰烬,骨灰,尸体,文化遗址 | cinder煤渣,灰烬 | repristination恢复原状

1. a fragment of incombustible matter left after a wood or coal or charcoal fire

    Synonym: clinker