The researchers used water and an ultrasonic extraction process, followed by gas chromatography-mass spectrometry to quantify the amount of cocaine in more than 230 bills collected in 17 cities.
研究人员从17个城市收集到230张纸币样本，并使用水和超声波提取方法，再加上气相色谱分析-质谱法对样本进行测试。
At present, 8 cities in Hunan have used gas, including 750,000 consumers in Chang-Zhu-Tan area.
目前湖南省已有8个城市使用天然气，长株潭已有75万用户。
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