那么氦原子核的电荷量是多少呢？
所以我们来对屏蔽举两个例子，如果我们在讨论氦，举例来说一个氦原子核或者氦原子。
So let's take two cases of shielding if we're talking about, for example, the helium, a helium nucleus or a helium atom.
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.
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 showers of daughter particles.
正因为这样，氦4原子核的质量减少了。
Because of this, the quality of helium-4 nucleus has been reduced.
正因为这样，氦4原子核的质量减少了。
Because of this, the quality of helium-4 nucleus has been reduced.
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