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.
而其在俄勒冈州，俄亥俄州，马苏莱州的生产线通过改善化学处理设备，以达到在2011年7月前减少二氧化硫排放的目的。
At its facility in Oregon, Ohio, Marsulex will improve chemical processing equipment, which will reduce sulfur dioxide emissions by no later than July 2011.
可是那些在凹点的金线不太可能被带回地球，所以科学家还不能确定这在每个“夏天”都在凹点排成线而且发光的黄色灰尘的化学成分。
The 'gold' pits isn't likely to be ferried back to Earth, though - scientists remain unsure of the chemical composition of the yelllow, shimmering dust that lines the pit walls every 'summer'.
应用推荐