smog

名词 smog:

1. air pollution by a mixture of smoke and fog
   同义词：smogginess

1. Smog has thickened the air.
   烟雾于天空阴霾。
2. On the night of December1,1930, a cloud of smog moved over a valley in Belgium, which caused thousands of people to become ill.
   1930年12月1日晚上，一片烟雾飘过比利时的一个山谷，这使数千人病倒了。
3. Smog hung in the sky (over the city).
   (城市)上空烟雾弥漫。