But when we study very distant bodies, we find that their absorption spectrum is slightly different from what we’d expect, given our knowledge of typical star compositions.

但是当我们研究非常遥远的天体时，我们发现它们的吸收光谱与我们预期的略有不同，这是基于我们对典型恒星组成的了解。

But when we study very distant bodies, we find that their absorption spectrum is slightly different from what we'd expect, given our knowledge of typical star compositions.

但是当我们研究非常遥远的天体时，我们发现它们的吸收光谱与我们预期的略有不同，因为我们对典型恒星组成的了解。