化学受体

例句：

1. 1. Chemical receptors are the gatekeepers of our body's defense system.
   化学受体是人体防御系统的大门。
2. 2. The receptor is responsible for detecting and responding to signals from the environment.
   受体负责检测和响应来自环境的信号。
3. 3. Researchers have discovered that certain chemicals can activate these receptors, leading to allergicreactions.
   研究人员发现某些化学物质可以激活这些受体，导致过敏反应。