That explained why stable atoms didn’t just collapse.

这就解释了为什么稳定原子不只是坍缩。

But we know that stable atoms do exist, so there had to be something missing.

但我们知道稳定的原子确实存在，所以肯定少了点什么。

But in real-lifey, science-non-fiction, we haven't managed to make any of these stable, super-heavy atoms yet.

但在现实生活中， 非科幻小说中，我们还没有设法制造出任何这些稳定的超重原子。

But then, after 380 millennia, it had cooled enough that electrons could combine with protons and helium nuclei, becoming stable neutral atoms for the very first time.

但是，在38万年之后，它已经足够冷却，电子可以与质子和氦原子核结合，第一次成为稳定的中性原子。

Those extra neutrons are necessary for atoms with atomic numbers higher than thirty or so, as you can see in this chart relating the number of neutrons to the number of protons in a stable atom.

对于原子序数高于 30 左右的原子来说，这些额外的中子是必需的，正如您在这张图表中看到的，中子数与稳定原子中质子数的关系。