kiln for small pieces

例句：

1. 1. The kiln was used to bake bread in ancient times.
   古代使用窑来烘焙面包。
2. 2. The kiln is the heart of the factory's production process.
   窑是工厂生产流程的核心。
3. 3. The kiln produced a large amount of coal for the village's heating system.
   窑为村庄的供暖系统生产了大量的煤炭。