proton activity

例句：

1. 1. The study of the proton activity in stars is crucial for understanding their evolution.
   研究恒星中的质子活动对于理解其演化至关重要。
2. 2. The proton spin in the nucleus of a neutron star can be measured using particle accelerators.
   中子星的核内的质子自旋可以通过粒子加速器进行测量。
3. 3. Proton currents are responsible for the flow of charged particles through space.
   质子电流负责带电粒子在空间中的流动。