tracheal glands

例句：

1. 1.The tracheal glands produce a substance that helps to regulate airflow in the lungs.
   气管腺产生一种物质，有助于调节肺部的气流。
2. 2. In some species, these glands play an important role in the immune system.
   在某些物种中，这些腺体在免疫系统中起着重要作用。
3. 3.Researchers are studying how these glands work and how they can be used to treat diseases.
   研究人员正在研究这些腺体如何工作，以及它们如何被用来治疗疾病。