The violet light of dusk began to darken the sky.
紫罗兰色的黄昏降临，天空开始暗下来。
Ozone is produced by the reaction between oxygen and ultra-violet light.
臭氧由氧气和紫外线发生反应而产生。
Ozone is produced by the reaction between oxygen and ultra - violet light.
臭氧由氧气和紫外线发生反应而产生。
Ozone is produced by the reaction between oxygen and ultra - violet light.
臭氧由氧气和紫外线发生反应而产生。
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