Scientists had to wait until the development of a technique called gas chromatography/massspectrometry to identify traces of methoxypyrazines.
科学家们只得一直等到叫做气相色谱或是质谱的技术的出现，才得以识别出痕量的甲氧基吡嗪。
2
To do this, the oils were broken into their component parts and analysed using gas chromatography and massspectrometry.
实验过程中，他们将精油分散成各自的组成成分，用气体色谱分析法和质谱分析法进行分析。
3
The researchers used water and an ultrasonic extraction process, followed by gas chromatography-massspectrometry to quantify the amount of cocaine in more than 230 bills collected in 17 cities.