So let's take two cases of shielding if we're talking about, for example, the helium, a helium nucleus or a helium atom.
3
这些粒子主要是质子、电子和氦原子核,并且当他们与地球高层大气中的原子核碰撞,就能产生次级粒子簇射。
The particles are generally protons , electrons and helium nuclei and when they collide with nuclei in the Earth's upper atmosphere they can produce shower s of daughter particles.