optical emission spectrography

例句：

1. 1. The researchers used the technique to analyze the chemical composition of the sample.
   研究人员使用这种方法分析了样品的化学成分。
2. 2.This method is particularly useful for analyzing complex samples with high sensitivity.
   这种方法特别适用于分析高灵敏度的复杂样本。
3. 3. The optical emission spectrography was instrumental in identifying the source of the pollution.
   光学发射光谱学在确定污染源方面发挥了重要作用。