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。
A third nonthermal process known as photochemical escape operates on Mars and possibly on Titan.
这些反应增加了不完全燃烧的可能性，更有可能释放未燃尽和光化学活性碳氢化合物到大气中。
These reactions increase the probability of incomplete combustion and are more likely to release uncombusted and photochemically active hydrocarbon compounds into the atmosphere.
光化性角化病，也称日光性角化病，病损生长缓慢，而且除了皮肤上的斑块或小斑点，常常无任何症状或体征。
An actinic keratosis, also known as solar keratosis, enlarges slowly and usually causes no signs or symptoms other than a patch or small spot on your skin.
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