When I first saw the eruption plume, it was a very white, steam-rich plume.
我第一次看到喷发出来的烟灰是白色的，非常白，就像蒸汽一样。
To test this idea, she and her colleagues designed a device that USES short pulses of electricity to ionise the surrounding air, creating a purple plume of plasma rich in oxygen ions.
为了验证这个想法，她和同事们设计了一种设备，利用短脉冲电使周围空气离子化，产生紫色富含氧离子的等离子火焰。
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