thick fog, mist. 濃霧, 薄霧

Walkers enjoy the sight of mist creeping across the lowland fields around Keswick in the northern Lake District
London Heathrow cancels 50 flights as Britain is blanketed by thick fog | Daily Mail Online
Read more: http://www.dailymail.co.uk/news/article-3299037/Heathrow-cancels-50-flights-wide-swathes-Britain-blanketed-fog-day-half-term-holiday.html#ixzz3qGUhW45j
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