But some relativistic calculations suggested it might actually behave like a different element , the inert ( and non-metallic ) gas , radon .

但基于相对论进行的计算表明，它更像一种独特元素、惰性（非金属）气体氡。

The pair used a signal-processing technique called the radon transform to create spectrograms of a variety of audio clips each just half a second long .

二人使用一种被称为氡变形的单处理技术创造出多种音频片段组成的声谱图，每种只有半秒长。

More recently , researchers have sought to associate electromagnetic fields , the radon or hydrogen content of the soil and seismicity patterns with impending earthquakes .

最近，研究人员寻求把土壤中的电磁场、氡或氢含量以及地震活动格局，同即将发生的地震联系起来。

There are dozens of natural causes of cancer , including ultraviolet light from the sun , natural radiation from radionuclides such as radon in rocks , and infection by viruses that trigger cancer , such as the human papilloma virus , which causes cervical cancer and hepatitis viruses that can cause liver cancer .

引发癌症的自然因素有很多，包括来自太阳的紫外光、来自放射性核素比如岩石中氡的自然辐射；病毒感染也能引发癌症，比如人乳头状瘤病毒能导致子宫癌而肝炎病毒能导致肝癌。