vitrified clay tile VCT

例句：

1. 1. The ancient city was built on a layer of viscous clay, which has now been vitrified and turned into a beautiful tile.
   这个古城建在一层粘性很强的粘土上，现在已经被硬化并变成了一块美丽的瓦片。
2. 2. The builders used the viscous clay to make the tiles, which were then vitrified and fired in akiln.
   建筑师们使用这种粘性粘土来制作瓦片，然后将其硬化并在窑中烧制。
3. 3. The viscous clay was carefully mixed with water and allowed to set, forming a hard, durable material that could be usedfor building and other construction projects.
   这种粘性粘土被小心地与水混合，并让其凝固，形成了一种坚硬耐用的材料，可以用于建筑和其他建设项目。