Each pattern stands for a distinct chemical element, and so different sets or patterns of spectral lines mean that the star has a different chemical composition.
每一种样式代表一种不同的化学元素，所以光谱线的不同集合或模式意味着这颗恒星有不同的化学成分。
2
What does it mean if an element is not present in a partial update?
如果一个元素没有在部分更新中描述，这意味着什么？
3
This doesn’t mean you ignore the human element—you never ignore it—but you deal always with the facts themselves, not with people’s emotional perception of those facts.