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
The measure technology of multi-channel nuclear energy spectral is the basis of matter composition analysis and radioactivity detection by way of nuclear analysis method.
多道核能谱测量技术是用核分析方法进行物质成分分析和放射性检测的基础。
3
With these spectral methods, the chemical composition and the structure of the polishing paste for plastics were identified.