When we measure the Sun's elemental abundance, we see it's roughly 75% hydrogen, 25% helium.

当我们测量太阳的元素丰度时，我们看到大约有75%的氢、25%的氦。

So, at this point, the elemental abundances were locked in.

所以，在这一点上， 元素丰度被锁定了。