湖泊效应、绿洲效应和沙漠化效应都证明本地水汽比外来水汽容易在本地形成降水；
And it's necessary to prove such point of view against some oppugns. The Lake effect, the oasis effect and desertification have all given proofs of this opinion.
水汽(比空气)较轻，否则它不会升到空中。
Water vapor is lighter, which would otherwise not rise into air.
但是随着防雾眼镜的发明，这种水汽蒙蒙的时刻——通常是由于镜片本身比周围空气温度低或者高——将会彻底终结。
But such steamy moments - which usually happen when lenses are colder or warmer than the air around them - could be wiped out with the invention of non-fogging glasses.
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