tetrahymenium

例句：

1. 1. The tetrodes are used in the detection of magnetic fields.
   四极管用于检测磁场。
2. 2. The tetrahymenium is a type of protozoan.
   四极虫是一种原生动物。
3. 3. The tetrahymenium is a fascinating organism that has been studied for centuries.
   四极虫是一种令人着迷的生物，几个世纪以来一直被研究。