internal firing of brick

例句：

1. 1. The brickswere heated internally before they were usedin the construction.
   这些砖块在被用于建筑之前，是先内部加热的。
2. 2.The fireman was able to extinguish the internal fire with water.
   消防员用水成功地扑灭了内部的火。
3. 3. Theengineer had to inspect the internal structure ofthe building for safety reasons.
   工程师出于安全原因必须检查建筑物的内部结构。