perlit

例句：

1. 1. The fire was perlite, which made it difficult to extinguish.
   火是粉状的，难以扑灭。
2. 2.The pyrotechnics were carefully prepared using perlite as the fuel source.
   焰火是用粉状燃料制成的，准备得非常仔细。
3. 3.The perlite bricks are used in construction to provide thermal insulation.
   粉状砖用于建筑中以提供隔热。