名詞 smog:

1. air pollution by a mixture of smoke and fog
   同義詞：smogginess

1. Smog has thickened the air.
   煙霧于天空陰霾。
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，一片煙霧飄過比利時(shí)的一個(gè)山谷，這使數(shù)千人病倒了。
3. Smog hung in the sky (over the city).
   (城市)上空煙霧彌漫。