1·Ozone at ground level - not to be confused with the ozone layer in the upper atmosphere - is one of the major constituents of photochemical smog.
与高层大气臭氧层不同的是，地面的臭氧是光化学烟雾的一个主要组成部分。
2·Turns out that light is needed, it's a photochemical reaction.
这个分解反应需要光，是一个光化学反应。
3·A third nonthermal process known as photochemical escape operates on Mars and possibly on Titan.
第三种形式的非热逸过程叫做光化学逃逸，只见于火星，但土卫六也可能存在这种现象。
4·The photochemical reaction of manganese in seawater and its influencing factors were studied.
对海水中锰的光化学反应及其影响因素进行了研究。
5·Certain air pollutants become more reactive and form noxious compounds in photochemical reactions.
某些空气污染物在光化学反应中变得活性更强，形成有毒的化合物。