一片厚度达3000米的污染云团atmospheric brown cloud

• 被称为“亚洲毒雾”肮脏的棕色云团每年冬季都在亚洲上空会升。

  A dirty atmospheric brown cloud, known as "toxic Asian smog", rises into Asia's skies every winter.

• 俄国山火的浓烟，将形成棕色云团，为亚洲以至南美带来健康问题。

  Thick smoke from hill fires in Russia will form an atmospheric brown cloud, bringing health problems to areas from Asia to South America.