正电子

例句：

1. 1. The positron emitted by the detector is detected by a computer.
   探测器发射的正电子被计算机检测到。
2. 2. The study of positron emission tomography (PET) is used to diagnose diseases in the brain.
   正电子发射断层扫描
3. 3. In nuclear physics, positrons are particles that have exactly the same mass as electrons but travel atthe speed of light.
   在核物理中，正电子是具有与电子相同质量但以光速移动的粒子。