paraformaldehyde

例句：

1. 1. This chemical is used to preserve and preserve the integrity of materials.
   这种化学物质用于保存和保持材料的完整性。
2. 2.The laboratory uses paraformaldehyde as a preservative in its specimen preparation process.
   实验室使用甲醛作为其标本制备过程中的防腐剂。
3. 3. Paraformaldehyde is a toxic gas that can cause respiratory problems when inhaled.
   甲醛是一种有毒气体，吸入时可能导致呼吸问题。