Leaks in chemicallines or inlet plumbing indicate a possible source of air in the system.
药剂管线或进口管渗漏，可能会是系统中空气的一个来源。
2
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。
3
This light is passed through a prism, which breaks it up into a spectrum, and a unique pattern, kind of like a chemical fingerprint of spectral lines for that element appears.