When the relative humidity in the atmosphere reaches and exceeds 100%, cloud or fog formation begins to occur.
当大气中的相对湿度达到和超过100%时，云或雾开始形成。
The solution effect of sulphite in the process of developer fog formation was Investigated by electron microscopy.
本文用电子显微镜方法研究了亚硫酸钠溶解作用对显影灰雾形成过程的影响。
The presence of clouds at night can also prevent fog formation of this type, because they trap the earth's heat, not allowing the cooling of the air for condensation.
在场的云层在夜间也能防止耐污型形成这一点，因为他们的陷阱地球的热量，不允许用于冷却空气的凝结。
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