orthohelium

例句：

1. 1.The positron emission tomography (PET) scan is used to detect abnormalities in the brain.
   正电子发射断层扫描用于检测大脑中的异常。
2. 2.The scientist detected a rare type of positronium in the sample.
   科学家在样本中检测到了一种罕见的正电子盐。
3. 3.The researchers found that the positronium molecules were responsible for the glowing effect.
   研究人员发现，正电子分子是发光现象的原因。