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。

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.

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这种成集群的钮扣被称为“随机图”中的“相互连接着的组件”，其中的"图"就是一些由线连接的节点的集合。

Such a cluster of buttons is called a “connected component” in a “random graph”, where a graph is just a set of nodes connected by lines.

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注意一个带点的线将会向您显示消息集合的精确位置(如图2所示)。

Notice that a dotted line guide shows you exactly where the message set will be dropped (see Figure 2).

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