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- 烟云，烟尘灰尘、烟或蒸汽组成的一团，悬垂于大气或外部空间
A mass, as of dust, smoke, or steam, suspended in the atmosphere or in outer space.
- 我们必须消除大城市里烟尘污染。
We must abate the smoke nuisance in our big cities.
- 呼吸乡间的新鲜空气而不吸入城市的烟尘是有益的。
It's good to breathe (in) fresh country air instead of city smoke.
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