nitrite nitrogen

例句：

1. 1.The chemical is used in fertilizers to increase plant growth.
   这种化学物质用于肥料中，以促进植物生长。
2. 2. Nitrite is a colorless gas that can be harmful if inhaled.
   亚硝酸盐是一种无色气体，吸入时可能有害。
3. 3.In the laboratory, nitrite is often used as an indicator of biological activity.
   在实验室里，亚硝酸盐常被用作生物活性的指示剂。