pyrophosphite

例句：

1. 1. This type of pyrophosphite is commonly used as a fire retardant in building materials.
   这种类型的磷磷酸盐常用于建筑材料中的防火剂。
2. 2. The chemistry of pyrophosphite is complex and requires careful handling.
   磷磷酸盐的化学性质复杂，需要小心处理。
3. 3. In the past, pyrophosphite was used as a fertilizer to improve soil quality.
   过去，磷磷酸盐被用作肥料来改善土壤质量。