chamotte

例句：

1. 1. The construction site was littered with cinders from the demolition.
   施工现场到处都是拆除后留下的煤渣。
2. 2. The coal mine is a source of valuable minerals and energy.
   煤矿是宝贵的矿物和能源的来源。
3. 3. The builders used cinders to level the ground before starting the new project.
   建筑者在开始新项目前用煤渣平整了地面。