positive ion-ring

例句：

1. 1.The positive ion-ring in the laboratory is a crucial component of the experiment.
   实验室中的正离子环是实验的关键组成部分。
2. 2.The positive ion-ring is responsible for the formation of the plasma.
   正离子环负责形成等离子体。
3. 3. The positive ion-ring plays a vital role in the operation of the spacecraft.
   正离子环在航天器的运行中起着至关重要的作用。