硝纸

例句：

1. 1. The paper was so thin that it crumbled easily.
   这张纸太薄了，很容易就破了。
2. 2. He used a piece of nitrate paper to mark his territory.
   他用一块硝化纸标记了他的领地。
3. 3. The scientist used nitrate paper to test the soil's pH levels.
   这位科学家用硝化纸来测试土壤的酸碱度。