ultraviolet-emitting source 紫外线发射源
NO2 is the main source of nitrate aerosols, which form an important fraction of PM2.5 and, in the presence of ultraviolet light, of ozone.
二氧化氮是硝酸盐气溶胶的主要来源，构成PM 2.5和在紫外线下臭氧的主要部分。
In years past, spicules had been judged too cool to be a source of the high temperature plasma that, among other things, generates the sun's ultraviolet light.
过去，人们认为针状体的温度太低，除了产生太阳的紫外线，并不足以作为高温等离子体的发射源。
Harmful ultraviolet rays cause 90 percent of skin damage [source: Poirot].
紫外线极具杀伤力，足以引起皮肤90%的损坏【Poirot研究中心】。
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